1925 ] New Species of North American Dolichopodidce 
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and the hairs of the abdomen are also yellow, except a few long 
ones on the hind margins of the segments; it has the third 
antennal joint drawn out into a long point. 
Gymnopternus robustus sp. nov. 
Male: Length 4 mm. Face and front covered, with grayish 
white pollen. Palpi black. Antennae black, third joint slightly 
longer than wide somewhat conical in outline. Orbital cilia 
wholly black. 
Thorax and abdomen blackish green, shining; pleurae black 
with white pollen. Hypopygium and its lamellae black, the 
latter somewhat crescent shaped with a short truncate protu- 
berance in the middle, which makes them appear wide in the 
center, they are fringed with black hairs, a few of which near the 
middle being bent at tip. 
All coxae and femora black with black hairs and yellow tips. 
All tibiae and basitarsi yellow, all tarsi being black from the tip 
of the first joint; posterior tibiae with an obscure brown spot at 
extreme tip on posterior surface. Joints of fore tarsi as 34-15-12- 
8-10; of middle ones as 51-23-19-16-11; first two joints of post- 
erior tarsi as 45-30. Calypters and halteres yellow, cilia of the 
former black. 
Wings grayish, very slightly tinged with brown in front of 
second vein; costa slightly, but distinctly thickened at tip of 
first vein, tapering to its tip; third vein bent backward a little 
towards its tip, parallel with fourth at tip, but slightly approach- 
ing fourth just beyond the middle of the last section of fourth 
vein; length of last section of fifth vein 53, of cross-vein 25 
fiftieths of a millimeter. 
Described from one male, taken at Manlius, N. Y., by Mr. 
H. H. Smith, in 1873. 
Type in the Cornell University collection. 
