NEW GENERA OF TWO-WINGED FLIES OF THE SUBFAM- 
ILY LEPTOGASTRINAE OF THE FAMILY ASILIDAE. 
By J. M. Avpricu, 
Associate Curator, Division of Insects, United States National Museum. 
The present paper is intended primarily to publish a remarkable 
new genus of fly in which the basal half of the wing is reduced to a 
slender hairlike stalk. In the study of related forms, however, it 
appeared that several new genera of the same subfamily are in the 
United States National Museum collection, and these have also been 
included, with a table of genera. 
The subfamily Leptogastrinae is readily separated from other 
Asilidae in America by having the pulvilli absent, the empodia either 
absent or reduced to a central almost straight claw, about half a 
long as the other claws; abdomen slender and elongated; marginal 
cell open, anal angle of wing undeveloped, and cell wide open. In the 
old world various connecting genera occur without pulvilli. I have 
included one such American genus, Caenarolia Thomson, in the pres- 
ent paper; it is shorter and stouter than the other included forms, 
and has the anal angle normally developed. 
TABLE OF AMERICAN GENERA. 
1. Wings uncommonly narrow at base, the seventh vein absent.............-.. 2 
Wings notmal, seventh vein Presentic 0. Te mamdes osc. oc. es acco See R sess 3 
2. Wing with basal half reduced to a hairlike pedicel, the auxiliary and first 
veins fused with the costa (Costa Rica). ........-.....-- Eurhabdus, new genus. 
Wing not with slender hairlike basal half, auxiliary and first veins present 
(Siro? 1 |) ao ea Re Le ge eee Ge gn) Ue Leptopteromyia Williston. 
3. Mesonotum with a pair of erect dorsocentral bristles, anterior to the middle; 
Welng hairy, (oss Tica)... cect net ot Lato aborts coe eee Schildia, new genus. 
Mesonotum without dorsocentrals (with one pair supraalars and one notopleural) 4 
4. Antennal style minute, hardly visible; wings longer than abdomen (Brazil) 
EVIAY SRNR Ee LUISA LID LSE E PLAT A) AERIS A CAS SE Caenarolia Thomson. 
Antennal style at least two-thirds as long as third antennal joint............. 5) 
5. Empodia entirely absent (widespread)............--------+-- Psilonyx, new genus, 
Empodia present as a median claw about half as long as the other claws (wide- 
STE a ee erie aR che a ae i care Vine a tied ain nade a ain Leptogaster Meigen. 
No. 2466.—PROCEEDINGS U.S. NATIONAL MUSEUM, VOL. 62, ART. 20. 
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