M. C. Van Duzee.
Table of North American Species of the Dipterous Genus Thrypticus, with Descriptions of Four New Species.
Psyche 22(3):84-88, 1915.

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84 Psyche [June
no reason to suppose that the development of the entomophilous flora would have varied in any respect had entomophily never arisen among the Coleoptera.
TABLE OF NORTH AMERICAN SPECIES OF THE DIP- TEROUS GENUS THRYPTICUS, WITH DESCRIP-
TIONS OF FOUR NEW SPECIES.
BY MILLARD C. VAN DUZEE,
Buffalo, New York.
While studying the Thrypticus in my collection and a little mate- rial that came to hand I found four forms that seem to be new. These are described below.
In willistoni Wh. the fore and middle cox= may be mostly yellow or infuscated almost to the tips, while in the female they may be somewhat blackened. This seems to be our most abun- dant species in western New York. I have seen examples from New England; Toronto, Ont.; and Columbia, Mo. I have taken
' a number of T. fraterculus Wh. at Lewiston, N. Y., and have seen a series of eight from Berkeley Hills, Cal.; Professor Aldrich re- ports it from Mexico.
The species of Thrypticus are minute flies of bright metallic color with a concave area in front of the scutellum and with the bristles and hairs of the thorax and abdomen yellow; the third and fourth longitudinal veins are usually convergent at tip, but sometimes parallel, and the hypopygium is flexed under the abdomen, often reaching nearly to the thorax. The hypopygia of the males of those species I have examined are very similar. There is a large capsule or outer part which is covered with scales of pollen that are always inclined backward. Its appendages are lamellubrm with a pair of slender processes at their base in most species (these seem to be lacking in willistoni). There is also a central filament (the penis) which originates on or near the base of the hypopygium and usually extends nearly to the end of the lamellae; this filament is inclosed in a sheath which is shorter and often so closely applied to it that the two appear to form one piece. In the drawing of aurinotatus sp. nov. this filament does not show as it was folded under the abdomen. Pachc 22:84-88 (1915). hup Yipsychc einclub org/22/22-0a4 html



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19151 Van Duzee-Dipterous Genus Thrypticus 85 Most of the species of this genus are difficult to separate except by the hypopygium and its appendages, and great care should be taken to place the specimen so as to get a direct side view of these organs, or the perspective will give a very wrong idea of their form.
In mounting them it is always best to extend the hypopygium, which can be done easily with a pin.
Some allowance must be made for shrinkage and also for varia- tion in color, but I do not think the variation is great. This paper is based on the study of about fifty specimens. TABLE OF NORTH AMERICAN SPECIES.
..................................
1. Femora green (Fig. 2)
.fraterculus Wh.
Femora yellow ...................................................... 2 .................. 2. Venter and part of the dorsum of the abdomen yellow. .3
Abdomen without yellow except sometimes on the venter. ............... .4 3. Venter, whole of sixth abdominal segment, antennae and base of hypopygium ......................................
yellow (Fig. 8).
cupuliferus Aid.
Venter, first two abdominal segments, antennse and base of hypopygium ......................................
yellow (Fig. 1). abdominalis Say.
....... 4. Hypopygium ovipositor-like, bent under the abdomen .singularis Aid.
Hypopygiumnormal ................................................. 5 5. Fourth vein bent backward to meet the cross-vein, forming a distinct angle ............................................. at this point. .minor Aid.
Fourth vein only gently bent at the cross-vein. ......................... .6 6. Antennae yellow. .................................................... .7 Antennaeblack ...................................................... 8 7. Capsule of hypopygium truncate at tip (Fig. 3) ................ vietus n. sp. Capsule pointed at tip (Fig. 5) ....................... muhlenbergice 3. & C. 8. Hypopygial lamella sessile, rounded at tip (Fig. 9). .......... .tectus sp. nov. Lamella somewhat petiolate. ......................................... .9 9. Lamella nearly round (Fig. 6) ................ '. ............. willistoni Wh. Lamella large, somewhat oval, about twice as long as wide. ............. .10 10. Thorax green with violet reflections and a golden spot before the scutellum ......................................... (Fig. 4). aurinotatus sp. nov.
Thorax green or purple with the posterior depression green. ............. .ll 11. Thoracic dorsum purple, hypopygium rather pointed, lamella pointed. ....... pusillw Aid.
Dorsum of thorax green, hypopygium rounded at tip (Fig. 7) . . comosus sp. nov. Thrypticus abdominalis Say.
Chrysotus abdominalis Say., Jour. Acad. Sci. Philadelphia, VI, p. 169. Male: Length 2 mm. Eyes nearly touching below the antennae; face green (purple in one specimen); front purple; mouth parts yellow or yellowish brown; antennae and arista yellowish brown; bristles of the head and thorax yellowish. Thorax




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86 Psyche [June
green, sometimes with coppery reflections on the posterior part, in one specimen with purple reflections on the anterior part; pleurae green with the posterior edge yellow. Abdomen bright green with the first two segments almost entirely yellow; venter yellow; hypopygium (Fig. 1) brown with the base yellowish; its appendages yellow, the lamella with mixed yellow and black hairs. Coxse and feet pale yellow with yellow hairs.
Tegulse, their cilia and the halters yellow. Wings hyaline,
slightly tinged with gray; veins yellowish. Redescribed from four males: one in the Cornell University collection, taken about the first of June at Columbus, Mo., by C. R. Crosby; one in the collection of C. W. Johnson and taken at Hot Springs, N. C., and two from Opelousas, La., in April. In the drawing the central filament is separated from its sheath and bent upwards, usually it is carried in its sheath and they appear to form one piece.
Thrypticus vietus sp. nov.
Male: Length 2 mm. Eyes contiguous (or seem to be, the head is shrunken); front green; palpi yellow; antennae yellow, darker at tip; bristles of the head and the arista yellowish, but brown in certain lights. Thorax bright but dark green; abdomen dark metallic green with slight violet reflections toward the base; hairs and bristles of the thorax and abdomen yellow; hypopygium (Fig. 3) brown with yellow appendages; lamella oval, rather large; filament black with yellow tip which is a little spear-shaped. Fore coxae yellow; middle and hind cox= black with yellow tips; femora, tibiae and tarsi pale yellow, their hairs mostly yellowish. Tegulae, their cilia and the halters yellow. Wings grayish hyaline; veins brown; third and fourth veins parallel.
Female: Ovipositor minute, reddish yellow; tip of the abdomen and the base of the segments reddish coppery; face bluish green. Described from one male and one female which I took at Braden- town, Fla., March. Type in the author's collection. Thrypticus comosus sp. nov.
Male: Length 1.75 mm. Face dark green, shining, wide at the antennae but the eyes almost meeting at the oral margin; mouth parts yellowish; Front dark green, ocellar bristles brownish yellow; antennae dull black, small. Thorax and abdomen dark green, very shining, the former with slight golden reflections; bristles of the thorax and abdomen yellowish; hypopygium black, shining, its appendages yellow; (Fig. 7); lamella large with minute pubescence and several bristly hairs on the surface, behind the lamella there is a slender bristly appendage and back of this two long slender hairs, which are nearly as long as the hypopygium; filament dark yellow. Fore cox= yellow; middle and hind cox= black with greenish reflections and yellowish tips; femora, tibiae and tarsi pale yellow; last joint of the middle and last two joints of the fore tarsi blackish. Tegulae, their cilia and the halters yellowish.
Wings hyaline; veins brown; venation as in willistoni.



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PSYCHE, 1915.
VOL. XXII, F'LATE V.
EXPLA4NATION OF PLATE 7.
Hypopygia of Thrypticus. Fig. 1, T. abdominalis Say; fig. 2y T. fruterculu~ M7hee1er; fig. 3,
T. cietus sp. nov.; fig. 4, T. au~inotatus sp, nov.; fig. 5, T. muhlenbergi~ J. & C.; fig. 6, T. willistoni Wheeler; fig. YY T. cornoms sp. nov.; fig, 8, T. cupulij'erus Aldrich; fig. gY T, tectus sp. nov. In the drawings, the scales of pollen appear as hairs inclining back- ward, there are no real hairs on the capsules of any of the hypopygia that I have examined.




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19151 Van Duzee-Dipterous Genus Thrgpticus 87 Described from two males, one taken at Ellis, N. IT., on June 13; and one at Toronto, Ont., July 4.
Type in the Cornell Uni-
. versity collection.
This species differs from others in having two long slender hairs near the base of the hypopygial lamella, and in the form of the hypopygium. It comes near aurinotatus sp. n017. in the form of the hypopygium and its appendages.
Thryticus tectus sp. hov,
Male: Length 2 mm. Face bright green? narrow; mouth parts black; front violet, shining; frontal bristles black; antenne small black; arista dark browny pubescent. Thorax and abdomen bright green with yellow hairs and bristles which appear dark brown when viewed from the side; hypopygium black? only a little shining, its appendages short and yellow? lamella rounded at tip (Fig. 9). Fore coxe and legs pale yellowy tarsi scarcely infuscated at tips; middle and hind cox= infuscated almost to the tips; fore cox% slightly darkened on the front surface; hind coxe with a slender bristle on the outer side. Halters yellow. Wings wit11 the venation typical of the genus; tinged with gray; veins brown. Described from one male taken at East Auroray Erie County, N. YVy July 1%
Type in the author's collection.
This comes so near willistoni Wh. that it was with some hesita- tion that I separated it.
It looks like that species with the lamelle half concealed, but it also has the appendages at their base m7ell developed, these appendages are not f&nd in willistoni, the lamella is also more hairy,
Thripticus aurinotatus sp. nov.
Mde: Length 1.25 mm.
Face narrow; front black (opaque in type specimen); antenne and arista, brown, densely covered with pale pubescence, the former with the third joint somewhat rounded at tip. Thorax dark green? appearing dark violet when viewed from the front; depressed portion before the scutellum very conspicuous, being deep? well defined and of a golden color when seen from behind. Abdomen dark green; all the hairs and bristles of the thorax and abdomen yellow; hypopygium (Fig. 4) black? appendages pale yellow, lamella large and rather pointed, the inner appendages are also larger than in most species and as long as the lamella. Teguley their cilia and the halters pale yellow. Coxe and legs
pale yellow with the hairs mostly yellow. Wings grayish hyaliney veins yellowish brown, becoming yellow at the root of the wing; venation about as in T. willis- toni Wh.
Described from one male from Billy's Islandy Okefenokee Swamp, Ga.
Taken by Dr. J. C. Bradley in June. Type in the Cornell University collection.




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