Technical Bulletin No. 673

May 1939

THE DISTRIBUTION OF

INSECTS, SPIDERS, AND MITES IN THE AIR

BY P. A. GLICK

Assistant Entomologist

Division of Cotton Insect Investigation

Kureau of Entomology and Plant Quarantine?

United States Departmentof Agriculture,Washington, D. C.

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Technical Bulletin No. 673

May 1939

UNITED STATES DEPARTMENT OF AGRICULTURE WASHINGTON, D. C.

THE DISTRIBUTION OF INSECTS, SPIDERS, AND MITES IN THE AIR1

By P. A. Glick

Assistant entomologist, Division of Cotton Insect Investigations, Bureau of Ento- mology and Plant Quarantine 2

CONTENTS

Page

Introduction 1

Scope of the work . . 3

The collecting ground 6

Airplane insect traps . 6

Operation and efficiency of the traps 8

Seasonal distribution of insects ... 9

Altitudinal distribution of insects 12

Day collecting 12

Night collecting 16

Notes on the insects collected 16

Winged forms 59

Size, weight, and buoyancy 84

Wingless insects 87

Immature stages 90

Insects taken alive 91

Meteorological data 93

Temperature.. 93

Dew point 93

Relative humidity 100

Page Meteorological data— Continued

Absolute humidity 101

Vapor pressure... 102

Barometric pressure.. 104

Air currents.. 108

Light intensity. 122

Cloud conditions 126

Precipitation 128

Electrical state of the atmosphere 129

Effects of the Mississippi River flood of 1927

on the insect population of the air 130

Seeds collected in the upper air 132

Collection of insects in Mexico 133

Sources of insects and routes of migration 140

Aircraft as insect carriers 141

Collecting insects in the upper air 142

Summary 143

Literature cited 146

INTRODUCTION

Knowledge regarding the height to which insects may ascend has hitherto been obtained chiefly from observations made on mountains, where the insects, after all, were near terra firma; and from lighthouses,

1 Submitted for publication May 18, 1938.

2 The collecting of insects by airplane was first made possible by L. O. Howard, and the late W. D. Hunter, under the supervision of B. R. Coad. The work was continued under the direction of C. L. Marlatt while he was Chief of the Bureau of Entomology, F. C. Bishopp, acting in charge of Cotton Insect Investigations in 1930 and 1931, R. W. Harned, in charge of the Division of Cotton Insect Investigations, and R. C. Gaines of the Tallulah, La., laboratory. Acknowledgments are due to R. H. Flake, W. L. Bowes, M. D. Kearney, R. G. Long, R. C. Young, C A. Bennett, and the late pilot, G. C. McGinley, for assistance in the construc- tion of the airplane insect traps; and to the pilots who flew the airplanes that were used, G. C. McCinley, John F. Payne, R. L. Mitchell, and G. E. Thomas. Appreciation is also extended to Franklin Sherman III, Robert Spinks, Robert Tate, C. F. Rainwater, Albert Sherwin, J. W. Holley. R. G. Long, and especially to J.-M. Yeates, for their assistance in the manipulation of the traps on many of the flights and in recording the meteorological data. Most of the specimens that were collected were separated as to orders by C. F. Rainwater and the writer before they were mounted and sent to various specialists for further determina- tion. Most of the material was mounted by P A. Woke. The insects taken during the first 2 years of collecting, however, were prepared and mounted by the specialists in the Division of Insect Identification of the Bureau. Naturally the identification of the immense numbers of mangled insects that were collected was a laborious undertaking. For its efficient performance thanks are due to C F. W. Muesebeck, in charge of the Division of Insect Identification, and to Harold Morrison, formerly in charge of that Division, of this Bureau, who made arrangements for handling the major portion of the material. The specialists who identified the insects in the various orders are as follows: Araneida, E. A Chapin, H. E. Ewing, Irving Fox, and the late C. R Crosby; Acarina, H. E. Ewing; Collembola, the late J. W. Folsom; Thysanura, F. Sil- vestri of Italy, J. W. Folsom, A. B. Gurney, and H. E. Ewing. Orthoptera, Neuroptera, and Mecoptera, the late A. N. Caudell; Corrodentia, A. N. Caudell and A. B. Gurney; Isoptera, T. E. Snyder; Ephemerop- tera, A. N. Caudell and J. G. Needham; Odonata, J. G. Needham; Thysanoptera. Harold Morrison and J. D. Hood; Heteroptera, H. G. Barber and H. L. Dozier; Homoptera, Harold Morrison, P. W. Mason$

107703—39 1 1

2 TECHNICAL BULLETIN 6 7 3, U. S. DEPT. OF AGRICULTURE

monuments, high buildings {25f, and forest lookout stations (75). To collect insects thousands of feet above the earth's surface was quite a different problem to handle, and to accomplish this it was necessary to await the development of a method of observing or collecting them while in flight in some form of aircraft, and thus study, as it were, the "plankton" of the air.

The collection of insects in the upper air has been under considera- tion for many years. In the winter of 1924, at a meeting of the New York Entomological Society, there was a discussion of insect migra- tion. At this meeting there were present L. O. Howard, then Chief of the Bureau of Entomology, the late W. J. Holland, E. P. Felt, Frank E. Lutz, Charles Leng, William T. Davis, W. T. M. Forbes, A. J. Mutchler, George P. Engelhardt, and others. In the course of the discussion the value of obtaining information on the dispersal and migration of insects and of determining the heights to which they flew was emphasized, and everyone present was urged to give some thought and attention to the problem of getting this information, and in contriving some device whereby insects could be collected in the air high above the earth's surface. The use of airplanes was naturally suggested for this work, but no suggestions were made as to what kind of collecting device might be used on the airplanes.

The writer had not the remotest idea at that time that he would ever have the opportunity to work along this line. Late in the spring of 1925, however, he was transferred from what was then the Federal Horticultural Board to the Bureau of Entomology, and sent to Tallulah, La., where airplanes were being used in dusting experiments for the control of the boll weevil and mosquitoes. This equipment being available, it was suggested by Dr. Howard that someone on the staff of the Tallulah laboratory should work out a means of using an airplane to collect insects in the upper air. B. R. Coad, who was in charge of the laboratory at that time and the logical person for directing this work, asked the writer to present some plan whereby

P. W. Oman, W. L. McAtee, and Wm. T. Davis; Coleoptera, A. Q. Boving, M. W. Blackman, E. A. Chapin, H. S. Barber, W. S. Fisher, L. L. Buchanan, and J. C. Bridwell; Lepidoptera, August Busck, Carl Heinrich, Wm. Schaus, and the late F. H. Benjamin and H. G. Dyar; Hymenoptera, S. A. Rohwer, R. A. Cushman, A. B. Qahan, L. H. Weld, C. F. W. Muesebeck, Wm. Mann, Miss Grace Sandhouse, M. R. Smith, and H. H. Ross; Diptera, Alan Stone, the late J. M. Aldrich, J. R. Malloch, C. T. Greene, G. H. Bradley, W. V. King, E. P. Felt, and D. G. Hall; Siphonaptera, F. C. Bishopp.

The seeds collected at various times in the upper air were identified by the late F. V. Coville, S. F. Blake, the late A. S. Hitchcock, and Mrs. Agnes Chase, all of the Bureau of Plant Industry. Appreciation is extended to Mabel Colcord, in charge of the library of the Bureau of Entomology and Plant Quarantine, for many suggestions and for help in obtaining bibliographical references, and to Paul M. Gilmer for the interpretation and preparation of the meteorological data. The writer also wishes to thank the staff of the Tlahualilo Agricultural & Colonization Co., Tlahualilo, Durango, Mexico, for the preparation of a landing field and their kindness and consideration in offering their assistance and hospitality, at the time the air- plane collections of insects were made in Mexico. Those especially to be mentioned are Thomas Fairbairn, general manager, U. C Loftin, and W. Ohlendorff, field managers of the company.

In order to have a better understanding of the meteorological conditions, which were of paramount impor- tance in the study of the insect population of the upper air, it was necessary to consult various workers of the Weather Bureau of the U. S. Department of Agriculture. The writer is especially indebted to C. F. Marvin, former Chief of the Weather Bureau, who personally arranged introductions and assistance, as well as gave valuable suggestions and information; to W. J. Humphreys, meteorological physicist, for his interest, time, and valuable assistance given personally, in the explanation and interpretation of the mete- orological data used in this study; to W . E. Hurd, of the Marine Division; to R. T. Lindley, in charge of the climatological station at Vicksburg, Miss., who cooperated in checking meteorological records for com- parison with those of the Tallulah laboratory; and to W. R. Gregg. Chief of the Bureau, for his many helpful suggestions. The writer had the opportunity of visiting England and the continent in December 1937. While there he interviewed C. B. Williams, head of the department of entomology, Rothamsted Experimental Station, Harpenden, near London, and B. P. Uvarov, entomologist of the department of entomology, British Museum of Natural History. All references to their publications used in this report were personally checked by these eminent entomologists. The writer also met John A. Freeman of London, who has done important work in collecting insects with kites, both in the United States and in England. In England Mr. Freeman worked under the direction of A. C. Hardy, of the department of zoology and oceanography, University College, Hull, who has published several papers and reports on collecting insects in the upper air with kites, and on insect dissemination. In Paris the writer met Lucien Berland, ento- mologist of the Museum National D'Histoire Naturelle.

3 Italic numbers in parenthesis refer to Literature Cited, p. 146.

INSECTS, SPIDERS, AND MITES IN THE AIR 3

an airplane could be used for collecting insects. The following year, July 1926, the writer submitted diagrams and suggestions for an air- plane insect trap. The drawings were accepted and the trap was made, as described later, and installed on an airplane.

On August 10, 1926, at Tallulah, the first flight was made with this trap to collect insects, and, so far as is known by the writer, this was the first attempt to use an airplane in collecting insects. Several insects belonging to the orders Diptera and Hymenoptera were taken on this flight. Many insects were collected on several other nights made on August 23 and 27. The first published record of insects taken in a trap on an airplane was that of Felt (22, 23). On August 30, 1926, or just 20 days after the first flight at Tallulah, Dr. Felt succeeded in taking three insects. Only a few flights were made under Dr. Felt's direction and on only the one flight were insects taken.

This new means of investigating the insect fauna of the upper air is of both scientific interest and economic importance, for some of the most dangerous insect enemies of cultivated plants and the carriers of dreaded diseases of man and animals spread to distant places with the aid of air currents.

SCOPE OF THE WORK

The discussion of the airplane collection of insects which is given in the following pages is based on the data collected during the years from August 1926 to October 1931, inclusive. During the 5 years of the work more than 1,007 hours were spent in the exposures of the collecting screens. The actual flying time, including the exposures of the screens, amounted to 1,538 hours, of which 150 hours were flown at night. A total of 1,358 separate flights were made, most of them in Louisiana, but 44 were made in Mexico.

In addition to the day collections at altitudes of from 200 to 5,000 feet, which netted 22,580 specimens, 2,204 insects were taken at other heights, from 20 to 100 feet and from 6,000 to 15,000 feet, inclusive, (tables 1 and 2). In the night collections, at from 500 to 5,000 feet, 3,955 insects were taken (table 3). In all the data covers the collection of 28,739 specimens in Louisiana and 1,294 in Mexico.

In general, in the discussions the spiders and mites are counted with the insects.

TECHNICAL BULLETIN 6 7 3, U. S. DEPT. OF AGRICULTURE

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INSECTS, SPIDERS, AND MITES IN THE AIR 5

Table 2. Spiders and insects of the important orders taken at selected altitudes per 10 minutes of exposure of the collecting screens by daylight, Tallulah, La.t 1926-31

Altitude (feet)

Total flying time

Aran ei da

Heter- optera

Homop- tera

Cole- optera

Hymen- optera

Diptera

Total insects '

20

Minutes

721

10, 277

10. 101 9,767

10. 102 9,622

50, 315 53, 633

Number

Number

Number

Number

Number

Number

Number 25.87

200

0.61 .36 .23 .09 .04 .27 .26

0.54 .21 .11 .06 .02 .19 .20

1.46 .57 .37 .28 .10 .56 .57

2.20 .51 .16 .09 .05 .62 .66

1.60 .50 .24 .11 .06 .51 .52

5.03 1.96 1.05 .58 .29 1.80 1.86

13.03

1,000

4.70

2,000

2.41

3,000

1.35

5,000

.64

200-5,000 2

4.49

All altitudes *

4.62

1 Includes other orders in addition to those shown.

2 Includes other altitudes in addition to those shown above.

Table 3. Insects, spiders, and mites collected at night by airplane according to altitudes from 500 to 5,000 feet, with the number per 10 minutes' flying time in the important orders, Tallulah, La., 1926-31

500 feet

1,000 feet

2,000 feet

3,000 feet

5,000 feet

Total insects

Order

Total in- sects

In- sects per 10 min- utes' fly- ing time

Total in- sects

In- sects per 10 min- utes' fly- ing time

Total in- sects

In- sects per 10 min- utes' fly- ing time

Total in- sects

Num- ber 6

In- sects per 10 min- utes' fly- ing time

Num- ber 0.05

Total in- sects

In- sects per 10 min- utes' fly- ing time

Total in- sects

In- sects per 10 min- utes' fly- ing time

Araneida

Num- ber 28 2 4

Num- ber 0.17

Num- ber 18

Num- ber 0.12

Num- ber

7

Num- ber 0.06

Num- ber 1

Num- ber 0. 008

Num- ber 60 2 6 3 8. 5 7 179 855 854 26 150 177 1,331 292

Num- ber 0.09

Acarina

.003

Thysanura . .

2 2

1

.009

Orthoptera

1

.004

Corrodentia

7

2

6

115

521

680

8

105

101

788

181

.01

fiphemeroptera.

2

1

.007

Thysanoptera

1

5

14

16

1

7

9

37

13

.04

.12

.14

.008

.06

.08

.32

.01

Heteroptera

.69

3.13

4.09

.05

.63

.61

4.74

45

198

120

9

31

47 314

68

.30 1.33 .81 .06 .21 .31 2.11

12

88

26

5

5

16

130

20

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2

34

12

3

2

4

62

10

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.26

Homoptera

1.26

Coleoptera

1.26

Neuroptera

.04

Lepidoptera

.22

Hymenoptera

.26

Diptera

1.96

Unrecognizable. __

Total

2,548

15.31

853

5.73

314

2.52

136

1.11

104

.89

3,955

5.83

[Total collecting time, minutes].

1,664

1,488

1,248

1,225

1,165

6, 790

From the number of minutes flown and the average speed of the several planes used, it is estimated that approximately 88,827 miles were flown in the actual exposure of the screens in Louisiana. If the flights are reckoned from taking off on a collecting trip until landing, a distance of six times the circumference of the earth, or more than 150,000 miles, was flown in collecting: insects.

6 TECHNICAL BULLETIN 6 7 3, U. S. DEPT. OF AGRICULTURE

THE COLLECTING GROUND

Tallulah, La., where most of the flying was done, is located in the lower Mississippi Valley and is from 80 to 85 feet above sea level.

The terrain in the vicinity of Tallulah is almost ideal for collecting insects. In Madison Parish alone there are approximately 80,000 acres of land in clearings and in cultivation, with nearly four times as much, or over 300,000 acres, covered with swamps and forests. Viewing the country from an airplane at a high altitude, one notices little of the cultivated areas, but the eye follows extensive forests. They extend for 150 miles in a continuous line north and south, and run part way across the State east and west. Much of the swamp country is almost impenetrable, with great forests bordering many hundreds of small lakes, bayous, and rivers, lined with enormous cypress trees from which great festoons of Spanish moss hang down to the water's edge (pi. 1, A). The entire section is intertwined with bayous, which serve as the natural drainage canals of the region (fig. 1). The many lakes and swamps (pi. 1, B) are mostly connected with bayous, which finally empty into small rivers and thence into the Mississippi. In Madison Parish alone there are more than 60 lakes. This section is still an important logging center. One reser- vation, part of which is in Madison Parish, covers over 80,000 acres of forests and contains cypress, gum, ash, and oak.

Following the main highways through Madison and adjoining parishes, are located the clearings, and the land planted in cotton. The soil is rich and crops grow luxuriantly.

AIRPLANE INSECT TRAPS

Several types of insect traps were devised and used in making the collections of insects in the upper air. The original trap, as designed by the writer for use on a JN6H army primary training ship, was con- structed on the principles of a plate holder for a camera. It consisted of five screen-covered frames for catching the insects, with two suitable compartments or magazines for protecting the screens before and after exposure. The compartments were made of aluminum, covered with tin, and reinforced with wood. The trap was smaller in size, although heavier than those developed later. Refinements in construction, manipulation, and adaptation for use on different types of airplanes were made from time to time, but the basic principles remained un- changed throughout the work. In order to increase the strength to resist the tremendous air pressure and to reduce the weight, the com- partments in later models were made of steel tubing, welded together and covered with airplane fabric. The later models were further sim- plified so that only one compartment was needed.

Only one trap was used on the airplane during 1926 and 1927. Later two improved traps were installed between the wings of a bi- plane. These traps were used on four different DeHaviland Hi army biplanes. The two insect traps were placed either between the wings of a biplane or under the wing of a monoplane (pi. 2, A), one on each side of the fuselage (pi. 2, B). The wing structure, as well as the sup- porting struts, had to be made stronger than is customary for ordinary flying to compensate for the added wind pressure. When it became possible for the Bureau of Entomology to purchase a specially designed airplane for insect collecting, the late Eddy Stinson came to Tallulah

INSECTS, SPIDERS, AND MITES IN THE AIR 7

and studied the insect trap construction. He then returned to his fac- tory at Detroit and built a Stinson Detroiter SMl monoplane (pi. 2, B), in which special attention was given to the wing structure and the supporting struts. In 1930 a Travelair 4,000 biplane (pi. 3, B) was secured on which two of the last-model single compartment traps

Figure 1. Map of the country around Tallulah, La., showing the relation between the cultivated areas and the swamps and natural drainage channels.

(pi. 3, A) were used. This type of trap was adapted for use on the leading edge of the lower wing by Pilot G. C. McGinley. It differed from the ones previously used in that the exposed trays were pulled back to the original compartment by a mechanism controlled by a single wire to the cockpit The screen trays, or traps proper, are steel tubing frames fitted with a fine-mesh copper screen. In all of the types of airplane insect traps used, five screens, each 1 square foot in size, were used.

8

TECHNICAL BULLETIN 6 7 3, U, S. DEPT. OF AGRICULTURE

OPERATION AND EFFICIENCY OF THE TRAPS

The manipulation of the two-compartment trap is as follows: The unexposed screens are placed in compartment a (pi. 2, A). A steel wire runs from each screen, through guides, to the rear cockpit. When a desired altitude is reached, screen No. 1 is pulled into the open por- tion of the trap (b) and exposed for the desired length of time, then pulled into compartment c, where it is protected from further exposure. The remaining four screens are each exposed in the same manner. In the single-compartment traps (pi. 3, A) the screens are pulled back to the original compartment. The ends of the frames of the screens are

AIRPLANE COLLECTION OF INSECTS

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SURFACE METEOROLOGICAL DATA

SUMMARY EVAPORATION

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Figure 2. Record chart, showing the data recorded for one of the flights made on May 26, 1930. Records such as these were kept of each flight on which in- sect collections were made by airplane in the upper air. The insects collected at each altitude were kept separate after removal from the screens, and identi- fied later.

made to lit snugly, and they completely close the opening to the com- partment. In this way insects were prevented from entering until the desired elevation had been reached, and this eliminated the possibility of picking up insects as the airplane was taking off or landing.

The screens were covered with a thin coating of adhesive to retain the insects that came into contact with them. This adhesive is made of a saturated solution of castor oil and resin. If the adhesive is not thin enough and is not spread over the surface properly, the air will not pass through the mesh, and thus will cause many of the insects to be carried over or under the exposed tray. The period of exposure and rate of speed were standardized, and all records are based on the catch of one screen exposed for 10 minutes at a known speed. The insects were removed immediately after each flight, and placed in small vials, properly labeled according to time of collection and altitude (pi. 4, A and B). Special flight record sheets (fig. 2) were used on which to enter all the data for each flight.

Tech. Bull. 673. U. S. Dept. of Agriculture

Plate 1

A, Little Rainy Lake near Tallulah, La., showing a dense growth of moss-draped cypress trees. Much of the flying to collect insects was made over this and numerous similar lakes, many of which are hidden in almost impenetrable swamps and forests. B, Biplane equipped with insect traps flying over the swamps collecting insects.

Tech. Bull. 673, U. S. Dept. of Agriculture

PLATE 2

A, Insect-collecting trap attached to the wing of a monoplane. The unexposed screens are carried in compartment a. At b is shown a screen pulled into posi- tion for exposure. After exposure the screen is pulled into compartment c. the movements of the screens being controlled by wires (d) leading to the cabin of the airplane. B, a monoplane especially constructed to accommodate the insect traps such as the one shown in A.

Tech Bull. 673, U. S. Dept. of Agriculture

PLATE 3

A, A single-compartment insect trap adapted for use on the leading edge of the lower wing of a biplane; B, a biplane equipped with two single-compartment insect traps.

Tech. Bull. 673, U. S. Dept. of Agriculture

PLATE 4

A, Removing insects from the screens after the landing of the airplane. On account of the low temperatures experienced at high altitudes heavy flying suits are necessary. B, Removing insects from the traps after a night flight. Certain insects are found in the air only at night.

INSECTS, SPIDERS, AND MITES IN THE AIR 9

None of the specimens collected could have been carried up by suction caused by the ascent of the airplane, for the effect of the air blast from the propeller is to blow through the airplane and downward during ascent, as is evidenced during airplane dusting. The air is forced downward behind the airplane, and when the airplane is "chocked" and stationary, with the engine running, the force of the air blast is as great as the driving speed of the propeller.

Unquestionably some insects were carried away from the screens by swirl currents set up by the resistance of the screen in its passage through the air. It is probable that the weight and bulk of the insect affected this factor considerably, those insects of light weight (with a high aerostatic coefficient) probably being carried past the screen in a greater proportion to their total numbers than was the case with the heavier species. So far as is known there is no way of even approxi- mately evaluating actual conditions.

Most of the insects were completely smashed by coming into contact with the screens at high speeds, and in most cases it could not be determined whether they were alive or dead when caught. Yet, surprisingly enough, some of the delicate, soft-bodied insects (such as Diptera and aphids) were alive and in fair condition when removed. These battered specimens, often covered with adhesive, were difficult to determine and only the taxonomists' keen interest in the work enabled determinations to be made as to species in many cases.

The skill of the pilots who flew the collecting airplanes is evidenced by the fact that no fatalities occurred. For 5 years flights were made in all kinds of weather, and many of the night landings were made on an improperly lighted airfield by the aid of automobile lights. During 1930 and 1931, however, the airfield was equipped with standard lighting equipment, including a beacon, a powerful floodlight, and border lights. The airplanes were also equipped with landing lights as shown in plate 4. There were many forced landings, and several air- planes were "washed out." Only one major accident occurred, when a forced landing resulted in the destruction of the craft and injury to both the pilot (McGinley) and the writer. Such mishaps must be expected in a more or less hazardous undertaking.

SEASONAL DISTRIBUTION OF INSECTS

In order that insects could be collected in every month, it was most important that the flights be made in a region where they were active throughout the year. As far as 100 miles or more north of Tallulah many species of insects are more or less active during every month of the year. Accordingly, every month was represented in one or more years during the 5 years of flying to collect insects.

There is an abundance of data on the seasonal distribution of insects as they occur on the surface, but as to the height to which they fly, or at which they may be found from month to month, very little has been known. It is of interest as well as of economic and scientific importance to know at what heights insects may be found throughout the year. These altitudes depend to a great extent on weather conditions, which are considered under a later heading.

Including all altitudes, in the daytime the greatest numbers of insects per 10 minutes of collecting were taken in May, with November and September following. The fewest insects were taken in January and December (tables 4 and 5). In the night flights the greatest

10

TECHNICAL BULLETIN 6 7 3, U. S. DEPT. OF AGRICULTURE

numbers were taken in October, followed by May. No night nights were made in January, February, or March (table 6).

Table 4.— Insects, spiders, and mites collected by airplane in the daytime according to the orders and months of year at all altitudes, Tallulah, La., 1926-31

Order

Janu- ary

Feb- ru- ary

March

April

May

June

July

Au- gust

Sep- tem- ber

Octo- ber

No- vem- ber

De- cem- ber

Total

Araneida

Num- ber 126

Num- ber

77 8

1

Num- ber 80 16 10 2

Num- ber 144 16 6 5

Num- ber 133

4 8 1 6 16

9

14

426

139

377

2

Num- ber 147 1 3 4 2

Nmn- ber 92 2

1

1

Num- ber

77

Num- ber 132

Num- ber 134

Num- ber 119 1 3 1 1

Num- ber 140

1 1

Num- ber 1,401

Acarina

44

Thysanura

Collembola.. -

2

2

1 2

1 2

2 2 4

34 26

Orthoptera -

13

Isoptera -

13

11

1

1

9

322

89

484

1

19

Corrodentia

Ephemeroptera

1

3

5

6

2

5

34

237

150

374

1

6 1 3

15 117

97 266

1

2

1

1

5

8

6

70 5

Odonata .

1

4

242

73

482

2

7

482

143

256

1

2

21

Thysanoptera. .

6

245

93

336

3

2

578

130

422

2

91

Homoptera

Heteroptera

Coleoptera -

Neuroptera

20 44

95

74

30

200

270

48 196

66 44

78

3,079

1,080

3,566

10

Trichoptera .

3

Mecoptera

3

26

398

1,239

3

Lepidoptera

Hymenoptera

Diptera .

Siphonaptera

1 6

248

1 10

407

1 123

658

3

262 1,104

447 1,493

5

366

1,420

6 427 981

1 251

6 326 959

20 288 933

5

91

325

1

26

206

75

2,770

9,973

1

Unrecognizable

66

65

112

256

339

342

298

410

207

115

39

2,500

Total

609

876

1,809

2,727

3,414

3,099

2,268

2,356

3,347

2,488

1,183

608

24, 784

Total flying time, minutes

2,992

3,042

4,305

6,025

5,209

5,973

5,022

5,649

6,286

4,732

1,984

2,414

53, 633

Table 5. Spiders and insects of the important orders taken per 10 minutes of flying time by daylight in the different months of the year, Tallulah, La., 1926-31

Month

January

February...

March

April

May

June.

July

August

September.

October

November- December..

Total

Total

Ara- neida

Homop- tera

Heter- optera

Coleop- tera

Hymen- optera

Diptera

insects,

including

other

orders

Number

Number

Number

Number

Number

Number

Number

0.42

0.07

0.15

0.32

0.02

0.83

2.03

.25

.24

.10

.66

.03

1.34

2.88

.18

.56

.17

1.12

.28

1.53

4.20

.24

.53

.15

.80

.43

1.83

4.53

.25

.82

.27

.72

.86

2.87

6.55

.25

.40

.25

.63

.61

2.38

5.19

.18

.23

.19

.53

.85

1.95

4.52

.14

.43

.16

.59

.58

1.70

4.17

.21

.92

.21

.67

.63

1.97

5.33

.28

1.02

.30

.54

.61

1.97

5.26

.60

1.36

.24

.99

.46

1.64

5.96

.68

.27

.18

.32

.11

.85

2.52

.26

.57

.20

.66

.52

1.86

4.62

Total flying time

Minutes 2,992 3,042 4,305 6,025 5,209 5,973 5,022 5,649 6,286 4,732 1,984 2.414

53. 633

At the altitude of 200 feet the greatest numbers were taken in May and the next greatest in November. The smallest numbers were collected in January and the next smallest in December.

At the altitude of 1,000 feet the maximum numbers of insects were collected in November, with slightly fewer in May; the fewest were found in January and December.

At the altitude of 2,000 feet the greatest numbers of insects appeared in May with slightly smaller numbers in October, and the fewest in January and February.

INSECTS, SPIDERS, AND MITES IN THE AIR

11

Table 6. Spiders and insects of the important orders caught per 10 minutes of flying time at night, arranged by months, Tallulah, La., 1926-31

Month

Ara- neida

Ho- mop- tera

Heter- optera

Cole- optera

Lepi- dop- tera

Hy-

men- optera

Dip- tera

Total

insects,

including

other

orders

Total flying time

April

Number 0.33 .10 .09

Number

0.55

1.24

.51

.24

.73

2.02

4.04

.51

0

Number 0.11 .18 .16 .17 .23 .30 .74 0 0

Number

0.22

2.40

.97

.84

1.14

1.29

2.16

.91

0

Number 0.22 .08 .06 .10 .16 .32 .77 .08 0

Number 0.22 .36 .19 .12 .21 .27 .69 .11 0

Number 1.78 3.12 1.63 .93 1.55 1.70 5.32 .69 0

Number 3.56 8.36 4.13 2.84 4.53 6.33 14.91 2.94 .13

Minutes 90

May

500

June..

1,175

July -

805

August

.05 .11 .13 .22 0

1,638

September . -

1,457

October

700

November

275

December. _ .

150

The above 9 months..

.09

1.26

.26

1.26

.22

.26

1.96

5.83

6,790

At 3,000 feet the most insects were taken in October and September, and the fewest appeared in January, February, and December.

At the 5,000-foot altitude the peak of abundance of insects appeared in September. Nearly twice as many insects were taken in this month as in June, in which the next highest numbers were collected. The smallest numbers of specimens were found in December; and next to the smallest in January and February, in which months approximately equal numbers were collected.

In every month of the year, for the day collections, the order Diptera led in numbers taken (table 5). The other orders represented in the collections varied considerably in numbers with altitude and season. Many species were found in every month of the year.

The months in which the maximum and minimum numbers of insects were taken varied somewhat from year to year during the 5 years. The peaks of abundance were usually at about the same time each year, as were also the low catches, but in 1929 the greatest numbers were collected in September with a minor peak in June, whereas in 1930 and 1931 the maximum numbers were taken in May. The variation in the monthly maximum and minimum occurrences of insects for each year may be assigned to differences in the weather. The meteorological factors are discussed later.

The numerical abundance of the orders as they occur in the day collections for the various months are shown in table 4, and the figures in table 5 give the number per 10 minutes of flying.

Araneida were most abundant in November and December, with slightly more in November (table 5). The fewest specimens were taken in August. At the altitude of 1,000 feet most spiders were collected in November, and at 2,000 feet more were taken in December.

Homoptera appeared in greatest numbers in November (table 5). Fewest were found in January. During the summer the fewest specimens were collected in July. At the altitude of 2,000 feet the maximum numbers were taken iu October and the fewest in January, and for the altitudes of 3,000 and 5,000 feet the most Homoptera were collected in September.

Heteroptera were found in greatest numbers in October, and fewest in February. At the altitude of 1,000 feet more specimens were collected in November and fewest in January. At altitudes above 1,000 feet the numbers taken varied considerably.

12 TECHNICAL BULLETIN 6 7 3, U. S. DEPT. OF AGRICULTURE

Coleoptera were at their maximum abundance in March, with a few less in November, and fewest in January and December. At the altitude of 2,000 feet the greatest numbers were collected in May, June, September, and October, with about equal numbers for each; and the fewest were taken in January, February, August, and Decem- ber. At 3,000 feet Coleoptera were most abundant in June and October, and at 5,000 feet in June and September, with more in September.

Hymenoptera appeared in maximum numbers in May and July, about equal numbers having been taken in each of those months. Fewest Hymenoptera were found in January and February. At 1,000 feet Hymenoptera were most abundant in May and October, with a drop for the summer months in August. At 5,000 feet most specimens were taken in June, and no specimens in January, February, or November.

Diptera were most abundant in May and were fewest in January and December. At the altitude of 3,000 feet they were most abundant in April, May, and June, with about equal numbers for each of those months. In July and August there was a decided drop in the numbers taken at 3,000 feet and the lowest number was taken in February. At 5,000 feet Diptera appeared in greatest numbers in September, with the next highest numbers in June and the fewest in December.

Thysanoptera were collected mostly in June. Isoptera were taken only in the months of April and May, and too few specimens of the other orders were taken to justify comparative estimates.

In the night collections the Homoptera appeared in greatest num- bers in October. At the altitude of 5,000 feet, Homoptera were taken only in the months of August, September, October, and November.

Heteroptera were collected at night mostly in October. At the altitude of 3,000 feet they were found only in July and August and at 5,000 feet in August and September.

Coleoptera were taken at night in greatest numbers in May, with slightly fewer in October. They fell off considerably during July. At the altitude of 1,000 feet most specimens of Coleoptera were taken in May, August, and October, and at 2,000 feet, in May and October, with more in October.

Hymenoptera were collected at night mostly in October, with the next highest numbers in May.

Lepidoptera were most abundant in October at all altitudes.

Diptera were most abundant at night in October, with May second in the numbers taken. There was a decided drop in July. At 3,000 feet most specimens appeared in May, and at 5,000 feet most in October.

ALTITUDINAL DISTRIBUTION OF INSECTS

Twenty-four different altitudes, ranging from 20 to 16,000 feet, were flown. Six altitudes were used in the systematic studies, these being 200, 1,000, 2,000, 3,000, and 5,000 feet for the daytime, and 500, 1,000, 2,000, 3,000, and 5,000 feet for the night collections.

DAY COLLECTING

The numbers of insects collected in the daytime and arranged according to orders and altitudes are given in table 1. Eighteen orders of insects and the orders of spiders and mites were taken. Fourteen

INSECTS, SPIDERS, AND MITES IN THE AIR

13

thousand feet was the highest altitude at which insects'were taken, there being five Homoptera and two Hymenoptera collected at this height. The highest altitude at which any specimen was taken was 15,000 feet, at which one spider was caught on the screen. Had more flights been made at these higher altitudes more specimens would

5.00

4.80

2.40

1,000

5,000

2,000 3,000

ALTITUDE (FEET)

Figure 3.— Average numbers of insects of the important orders collected by airplane in 10 minutes flying by day at the indicated altitudes.

doubtless have been taken, but because of the difficulty in climbing, the time and expense involved, the types of airplanes used, and the air resistance offered by the insect traps, high altitudes were difficult to attain, and only one flight of 5 minutes was accomplished at 16,000 feet.

The comparative abundance of various orders according to altitudes may be learned from figure 3. Only the orders Homoptera, Heterop- tera, Coleoptera, Hymenoptera, Diptera, and the order of spiders

16 TECHNICAL BULLETIN 6 7 3, U. S. DEPT. OF AGRICULTURE

NIGHT COLLECTING

The altitudes flown at night were 500, 1,000, 2,000, 3,000, and 5,000 feet. Five hundred feet was considered to be the lowest altitude safe to fly at night. More insects were collected at night in propor- tion to the amount of time flown than during the day, the figures being 5.83 per 10 minutes of flight, as against 4.62 for the day. There were, however, only 12 recognizable orders of insects taken at night as compared with 20 orders of insects and mites taken in the day flights (tables 1 and 3). The orders of insects not represented in the night collections were Collembola, Isoptera, Odonata, Trichoptera; Mecoptera, and Siphonaptera. Even in the day flights, only a few insects belonging to these orders were taken.

At 1,000, 2,000, and 5,000 feet more insects weie taken per 10 minutes at night than during the day, but at 3,000 feet there were fewer insects taken than in the day collections. The actual numbers taken at night at the altitudes of 3,000 and 5,000 feet, however, are so small as compared with the day collections that great significance cannot be placed upon the figures. Wingless forms could not, of course, attain any height at night, since the general convectional movement of air at night tends to be downward rather than upward. Thus the few spiders and others wingless forms that were in the upper air would tend to come down at night. Table 7 also shows the approx- imate number of cubic feet of air per insect at night.

NOTES ON THE INSECTS COLLECTED

A discussion of each order is given with notes on the more interesting and the economic species taken. There were represented in the col- lections taken in the upper air 18 insect orders, and the orders of spiders and mites. Of the total of 28,739 specimens collected in Louisiana there weie represented 216 families, 824 genera, 4 new genera, 700 species, and 24 new species (table 8). The insects are shown in detail in tables 9 and 10.

Table 8. Insects, spiders, and mites collected by airplane according to the orders, families, genera, and species, Tallulah, La., 1926-31

Insects taken

Araneida

Acarina

Thysanura

Collembola

Orthoptera

Corrodentia

Isoptera

Ephemeroptera

Odonata

Thysanoptera..

Heteroptera

Homoptera

Coleoptera

Neuroptera

Trichoptera

Mecoptera

Lopidoptera

Hymenoptcra..

Diptera

Siphonaptera.. Unrecognizable

Total

Number

1,461

46

40

26

16

78

19

1(1

21

98

1.259

3.934

4. 420

36

3

3

225

2, 947

11.304

1

2. 792

28. 739

Families

Number

16

2

2

3

3

4

1

1

2

2

19

9

46

4

1

1

20

33

46

1

216

Determined genera

Number

37

1

4

7

4

8

1

3

6

12

63

73

193

4

1

1

38

244

123

1

824

New

genera

Number

Determined species

Number 30

1 4 5 6 1 1 4

15

69

80

175

6

1

32

195

74

1

roo

New species

Number

1

20

24

INSECTS, SPIDERS, AND MITES IN THE AIR

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16

TECHNICAL BULLETIN 6 7 3, U. S. DEPT. OF AGRICULTURE

NIGHT COLLECTING

The altitudes flown at night were 500, 1,000, 2,000, 3,000, and 5 000 feet. Five hundred feet was considered to be the lowest altitude safe to fly at night. More insects were collected at night in propor- tion to the amount of time flown than during the day, the figures being 5.83 per 10 minutes of flight, as against 4.62 for the day. There were, however, only 12 recognizable orders of insects taken at night as compared with 20 orders of insects and mites taken in the day flights (tables 1 and 3). The orders of insects not represented in the night collections were Collembola, Isoptera, Odonata, Trichoptera; Mecoptera, and Siphonaptera. Even in the day flights, only a few insects belonging to these orders were taken.

At 1,000, 2,000, and 5,000 feet more insects weie taken per 10 minutes at night than during the day, but at 3,000 feet there were fewer insects taken than in the day collections. The actual numbers taken at night at the altitudes of 3,000 and 5,000 feet, however, are so small as compared with the day collections that great significance cannot be placed upon the figures. Wingless forms could not, of course, attain any height at night, since the general convectional movement of air at night tends to be downward rather than upward. Thus the few spiders and others wingless forms that were in the upper air would tend to come down at night. Table 7 also shows the approx- imate number of cubic feet of air per insect at night.

NOTES ON THE INSECTS COLLECTED

A discussion of each order is given with notes on the more interesting and the economic species taken. There were represented in the col- lections taken in the upper air 18 insect orders, and the orders of spiders and mites. Of the total of 28,739 specimens collected in Louisiana there weie represented 216 families, 824 genera, 4 new genera, 700 species, and 24 new species (table 8). The insects are shown in detail in tables 9 and 10.

Table 8. Insects, spiders, and mites collected by airplane according to the orders, families, genera, and species, Tallulah, La., 1926-81

Insects taken

Araneida

Acarina

Tbysanura

Collembola

Orthoptera

Corrodentia

Isoptera

Epliemeroptera

Odonata

Tbysanoptera..

Heteroptera

Homoptera

Coleoptera

Neuroptera

Trieboptera

Mecoptera

Lepidoptera... Ilymenoptera..

Diptera ..

Siphonaptera.. Unrecognizable

Total

Number

1,461

46

40

26

16

78

19

10

21

98

1.259

3.934

4.420

36

3

3

225

2, 947

11,304

1

2. 792

28, 739

Families

Number 16 2 2 3 3 4 1 1 2 2 19 9

46

4

1

1

20

33

46

1

210

Determined genera

Number

37

1

4

7

4

8

1

3

6

12

63

73

193

4

1

1

38

244

123

1

824

New genera

Number

Determined species

Number 30

1 4 5 6 1 1

4

15

69

80

175

6

1

32

195 74

1

roo

New species

Number

1

20

24

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Oecobius parietalis Hentz

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Walckanaera rigilax Black wall

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americanus Schott

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Nemobius carolinus Scudder (male) ... Nemobius carolinus Scudder (females). Tridactylus minutus Scudder

INSECTS, SPIDERS, AND MITES IN THE AIR

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Hoplandothrips pergandei (Hinds)

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Liothrips castaneae Hood ?

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INSECTS, SPIDERS, AND KITES IN THE AIR

23

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Eremocoris ferus (Say)

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Platytylellus sp

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cher)._.

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Oncopsis sp

Oncometopia undata (Fabricius).

Onccmetopia lateralis (Fabricius)

Homalodisca triquetra (Fabricius)

Aulacizes irrorata (Fabricius)

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Graphocephala coccinea (Forster).

Graphocephala versuta (Say)

Draeculacephala mollipes (Say)

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Carneocephala flaviceps (Riley)..

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Xestocephalus pulicarius Van Duzee.

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Scaphoideus spp .

Platymetopius frontalis Van Duzee

Polyamia weedi (Van Duzee)

Deltocephalus flavicostus Stal

Deltocephalus sonorus Ball.

Deltocephalus spp

Exitianus obscurinervis (Stal)

Stirellus bicolor (Van Duzee)..

Stirellus obtutus (Van Duzee)

Phlepsius spp

Thamnotettix clitellarius (Say)..

Thamnotettix nigrifrons (Forbes)

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Trioza sp. near diospyri . .

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Sipha flava (Forbes)

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Carabidae Continued.

Stenolophus ochropezus (Say)

Stenolophus dissimilis Dejean

Stenolophus conjunctus (Say)

Tachistodes indistindus (Dejean)

Tachistodes testaceus (Dejean)

Tachistodes partiarius (Say)..

Tachistodes sp

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Carabidae, undetermined spp

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Haliplidae, undetermined sp

Dytiscidae:

Bidessus pullus (Le Conte) __

Bidessus granarius (Aub6j

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Coptotomus interrogatus (Fabricius)

Copetatus glyphicus (Say)

Dytiscidae, undetermined sp

Hydrophilidae:

Ochthebiussp _.

hydraena pennsylvanica Kiesenwetter. Hydraena marginicollis Kiesenwetter..

Ue lophor us sp .

Hydrochus sp

Berosus itriatus (Say)

Tropisternus striolatus (LeConte) .

Paracymus subcupreus (Say)

Paracymus sp

Enochrus sp

Cercyon sp

Scydmaenidae:

Conophron sp

Scydmaenidae, undetermined spp

INSECTS, SPIDERS, AND MITES IN THE AIR

31

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Saprinus sp

Lycidae:

Plater os sp. .. .. . ...

Lampyridae:

Pyropyga minuta (LeConte)--

Lampvridae, undetermined spp

Cantharidae:

Chauliognathus marginatus (Fabri- eius) . ... .

Cantharis bilineatus Say

Cantharis sp

Malachidae:

Collops quadrimaculatus (Fabrieius)...

Anthocomas erichsoni LeConte

Cleridae:

Monophy I la terminata (Say)..

Micromalthidae:

Micromalthus debilis LeConte...

Mordellidae:

Mordellistena aspera (Melsheimer)

Mordellistena pustulata (Melsheimer) .

Mordellistena sp .

Mordellidae, unletermined sp .. ... Anthicidae:

Notoxus bicolor (Sav)

Notoxus monodon ( Fabrieius)

Notorus sp.

Tomoderus constrictus (Sav)

A nthicus rejectus LeConte .. .

Anthicus vicinus LaFerte-Senectere

Anthicus cervinus LaFerte-Senectere. .

INSECTS, SPIDERS, AND MITES IN THE AIR

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INSECTS, SPIDERS, AND MITES IN THE AIR

35

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Chrysomelidae— Continued.

Lonqitarsus turbatus Horn

Longitarsus testaceus Melsheimer

Phyllotreta striolata (Illiger) -

Phyllotreta bipustulata (Fabricius)

Baliosus ruber (Weber)

Metriona bivittata (Say)

Metriona bicolor (Fabricius)

Chrysomelidae, undetermined spp

Bruchidae:

Acanthoscelides alboscutellatus (Horn)..

Acanthoscelides compressicornis (Schaef- fer)_—

Acanthoscelides bisignatus (Horn)

Acanthoscelides hibisci (Olivier)

Acanthoscelides submuticus (Sharp)

Acanthoscelides sp..

Megacerus sp. (near impiger).

Anthribidae:

Brachytarsus vestitus LeConte.

Curculionidae:

Apion metallicum Gerstaecker.

Hyperodes sp...

Smicronyr sp

Stenopelmus rufinasus Gyllenhal

Tanysphyrus lemnae (Fabricius)

Thysanocnemis sp.

Tylopterus pallidus LeConte

Anthonomus grandis Boheman (fe- males)

Anthonomus grandis Boheman (male).

Anthonomus albipilosus Dietz

Baris aerea (Boheman).

INSECTS, SPIDEES, AND MITES IN THE AIR

37

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TECHNICAL BULLETIN 6 7 3, U. S. DEPT. OF AGRICULTURE

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400

feet

(day)

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Mecoptera: Panorpidae:

Lepidoptera: Pieridae:

Colias eurytheme Boisduval

Nymphalidae:

Phyciodes tharos form marcia Edwards

Junonia coenia (Huebner).

Hesperiidae:

Epargyreus tityrus (Fabricius)

Antigonus nessus (Edwards)...

Hesperia leonardus Harris

Lerema accius (Abbott and Smith)

Lerodea eufala (Edwards)

Syntomidae:

Cisseps fulvicoUis (Huebner)

Cisseps fulvicoUis (Huebner) female... Noctuidae:

Heliothis obsoleta (Fabricius)...

Laphygma frugiperda (Abbott and Smith)...

Laphygma frugiperda (alive)

Eublemma obliqualis (Fabricius)

Autographa brassicae (Riley)

Alabama argillacea (Huebner)

Tetanolita mynesalis (Walker)

Ommatochila mundula Zeller

Bomolocha sp

Plathypena scabra (Fabricius)

Noctuidae, undetermined spp.

Qeometridae:

Qeometridae, undetermined spp

Pyralididae:

Nomophila noduella (Denis and Schif-

Loxostege similalis (Quenee)

INSECTS, SPIDERS, AND MITES IN THE AIR

39

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INSECTS, SPIDERS, AND MITES IN THE AIR

41

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feet

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feet

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300

feet

(day)

£•- i i i i i ! i i i i i i S i i S i i S i i i i i i i i i i i i ! i S S* i i i S i i i : i i i S i i : i : ! i i S i i i : i ! S i i ! i : !

200

feet

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50

feet

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Hymenoptera— Continued.

Ichneumonidae— Continued.

Hemiteles sp

Zamicrotoridea syrphicola (Ashmead)—

Hemitelini, undetermined spp..

Gelis sp. (male)

Hoplocryptus incertulus Cushman

Biapetimorpha acadia Cushman.

Derocentrus macUentus (Cresson)

Zaglyptus incompletus (Cresson)

Ephialtes aequalis (Provancher)

Orthocentrus sp

Orthocentrini, undetermined sp

Diplazon laetatorius (Fabricius)

Cymodusa eurycreonis (Ashmead)

Cymodusa sp

Sagaritis provanchsri (Dalla Torre)

Sagaritis oxylus (Cresson)

Pristomerus agilis (Cresson)

Neopristomarus melleus