THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 119 

 No. 75. DOLICHOPUS GENUALIS, new species. 



Male. — ^Length 4 mm.; of wing 3.7 mm. Face of moderate width, 

 silvery white. Front shining green with bronze reflections. Anten- 

 nae wholly black; third joint nearly twice as long as wide, obtuse at 

 tip, arista inserted a little before the tip on the upper edge. Lower 

 orbital cilia whitish, the upper cilia black. 



Thorax green with slight bronze reflections; pleurae dulled with 

 white pollen. Abdomen green with coppery reflections; the usual 

 white pollen on its sides rather thin, but covering most of the sides of 

 the segments. Hypopygium black; its lamellae (fig. 75a) of moderate 

 size, triangular in outline, with the apical edge cut off obliquely so as 

 to make the upper edge less than half as long as the lower and the 

 lower point very acute; they are white with a very narrow black 

 border on apical edge and with the acute point black; apparently 

 not jagged but fringed on the apical margin with brown hairs. 



Fore coxae yellow with a large black spot on the outer side at 

 base, their anterior surface covered with little black hairs. Middle 

 and hind coxae black with yellow tips. Femora and tibiae yellow. 

 Middle and hind femora each with one preapical bristle, the latter 

 black at tip, not ciliate below, the little black hairs on the outer side 

 descending to the lower edge; but on the inner surface, however, 

 there are a few delicate yellow hairs on the lower portion. Posterior 

 tibiae black at tip for nearly one-fourth their length, only a little 

 thickened. Fore tarsi a little longer than their tibiae, yellow, with 

 the last two and a half joints black, first joint nearly as long as the 

 remaining four taken together, fifth about as long as third and 

 slightly compressed, fourth a little shorter than fifth. Middle tarsi 

 one and a third times as long as their tibiae, black from the tip of 

 the first joint. Hind tarsi wholly black. Calypters and halteres 

 yellow, the former with black cilia. 



Wings (fig. 75) grayish; costa not enlarged at tip of first vein; 

 last section of fourth vein bent before its middle; third vein dis- 

 tinctly bent backward so as to approach the fourth at their tips; 

 hind margin of wing scarcely indented at tip of fifth vein, rather 

 evenly rounded, the anal angle not being very prominent. 



Female. — Face wide, white; third antennal joint small, about as 

 long as wide, the arista inserted just above the pointed tip; femora, 

 tibiae, and wings about as in the male. Middle tibiae with one 

 bristle below, their basitarsi without a bristle above. 



Described from 1 male and 3 females. The male was taken at 

 Moosehead, Maine, July 18; 1 female at Machias, Maine, July 20; 1 

 female at Fogo Island, Newfoundland, July 29, and the other 

 female at Grand Lake, Newfoundland, July 25, 190G; and one female 

 taken at Waubamic, Ontario, June 14, by H. S. Parish, and in the 

 collection of A. L. Melander. 



