THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 237 



and the anal angle, forming two small lobes, one at tip of sixth vein 

 and one at the anal angle, which is produced toward the root of the 

 wing. 



Described from 2 males taken by C. T. Greene at Great Falls, Vir- 

 ginia, June 27, 1915. 



r?/2)e.— Male, Cat. No. 23051, U.S.N.M. 



This species is very much like both slossonae and TiarhecJci in the 

 form of the wing. 



No. 173. DOLICHOPUS BAKERI Cole. 



DoUchopus baJceri Cole, Pomona College Journal of Entomology and Zoology, 

 vol. 4, 1912, p. 839. 



Male. — Length 3.75-4.75 mm.; of wing 3.75-4.5 mm. Face wide 

 and short, white, tinged with yellow just below the antennae. Front 

 purple, narrowly green above the antennae and along the orbits, 

 sometimes mostly green. Antennae wholly black; third joint some- 

 what oval, a little longer than wide, pointed at tip. Lateral and in- 

 ferior orbital cilia pale yellow, about seven of the upper cilia on each 

 side black. 



Thorax green with coppery reflections, sometimes more bronze 

 brown; pleurae dulled with white pollen. Abdomen green with cop- 

 pery reflections, the apical segments mostly coppery. Hypopygium 

 black with coppery reflections; its lamellae (fig. 173o) rather large, 

 somewhat triangular, but a little rounded at apical edge, whitish 

 with a black border on apical margin, jagged and bristly at apex. 



Fore coxae yellow, a little blackened at base on outer side, anterior 

 surface with conspicuous little black hairs. Middle and hind coxae 

 black with yellow tips. Femora and tibiae yellow. Middle and 

 hind femora each with two preapical bristles, the latter ciliated on 

 lower inner edge with long, delicate, yellow hairs, the longest of 

 which are a little longer than the width of the femora. Posterior 

 tibiae thickened and a little compressed, the usual glabrous stripe on 

 upper edge distinct, inner surface alsc with a glabrous stripe for 

 about one-third their length. Fore and middle tarsi a little longer 

 than their tibiae, hind tarsi one and a third times as long as their 

 tibiae; all tarsi black from the tip of the first joint; first joint of 

 fore tarsi scarcely as long as the remaining four joints taken together; 

 middle basi tarsi about as long as the two following joints together, 

 without a bristle above, their tibiae with one long bristle below. 

 Calypters and halteres yellow, the former with black cilia. 



Wings (fig. 173) grayish; costa with a small enlargement at tip of 

 first vein, gradually tapering: last section of fourth vein a little 

 bent just before its middle; third vein nearly straight; hind margin 

 of wing a little indented at tip of fifth vein; anal angle prominent. 



Female. — Very much like the male in color, form of antennae, 

 preapical bristles, and form of wings and tarsi; the face is wide, hind 

 187329—20 16 



