44 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



at second joint. Hind tarsi a little longer than their tibiae. Calypters, 

 their cilia, and the hal teres yellow. 



Wings (fig. 6) grayish with a faint brown clouding from the costa 

 to the third vein, and from the tip of first vein to tip of tliird, more 

 distinct in some specimens than in others; costa not enlarged at tip 

 of first vein; last section of fourth vein bent near its middle; hind 

 margin of wing not indented at tip of fifth vein; anal angle of wing 

 nearly obsolete, the wing being narrowed toward the root. 



Female. — Agrees with the male in color, form of antennae, legs 

 and wings, except that the middle tarsi are shorter and less flattened 

 and the anal angle of wing a little more prominent. The face is a 

 little wider and the lower orbital cilia are but little flattened. 



Described from 12 males and 3 females. J. M. Aldrich took 3 

 males and 3 females at Hagerman, Idaho, July 1, 1900, and 7 males 

 at Wells, Nevada, July 12, 1911. C. L. Fox took 1 male at Olancha, 

 Inyo County, California. I took 1 male at Great Salt Lake, Utah, 

 June 8, 1915. 



r?/p^.— Male, Cat. No. 22981, U.S.N.M., from Hagerman, Idaho. 



No. 7. DOLICHOPUS VIRIDIS, new species. 



Male. — Length 3.5 mm.; of wing the same. Face rather wide, 

 long, rounded below, silvery white. Front dark shining green. 

 Antennae (fig. 7a) wholly black; third joint longer than wide, oval. 

 Lower orbital cilia silvery white, the lowest ones much flattened; 

 the black cilia not descending to the middle of the eye. 



Thorax dark blue-green, sometimes almost black-green, very shin- 

 ing; pleurae dulled with a little gray pollen. Abdomen colored about 

 like the thorax. Hypopygium black, its lamellae small, somewhat 

 triangular in outline, whitish with a black apical border, which is 

 widest at upper and lower corners, a little jagged at lower corner, 

 fringed with delicate dark hairs. 



Coxae, legs and feet black, extreme tips of coxae and knees a little 

 yellowish. Fore coxae with white pollen. Middle and hind femora 

 each with one preapical bristle, the latter not ciliate below. Hind 

 tibiae only a little stouter than the others. Fore tarsi plain, about 

 one and a fourth times as long as their tibiae; first joint as long as 

 the following three taken together; second nearly half as long as 

 first, fourth and fifth of nearly equal length; each joint of the tarsi 

 a little narrowed at base. Middle tarsi only a little longer than their 

 tibiae, their basitarsus without a bristle. Calypters and halteres 

 yellow, the former with white cilia. 



Wings (fig. 7) a little tinged with brown, sometimes much so on 

 the costal edge and along the veins; costa much enlarged from the 

 tip of the first vein two-thirds of the way to the root of the wing, 

 filling in the angle between the costa and the first vein but not ex- 



