46 BULLETIN 116, UNITED STATES NATIONAL MUSEUM. 



of wing scarcely indented at tip of fifth vein; anal angle not promi- 

 nent, the wing being narrowed toward the root. 



Female. — ^A female taken at the same time as one of the males has 

 the face wider, silvery white; the extreme tip of the fore tibiae are 

 yellow; the second and third joints of the fore tarsi are nearer of a 

 length than in the male, still the second is a little the longest; wings 

 grayish and a little wider; anal angle rounded and not at all promi- 

 nent. 



Described from 2 males and 1 female from Idaho; 1 pair were 

 taken at Bovill,- June 17, 1911; the other male at Moscow Mountain 

 July 7, 1918. All 3 specimens were taken by A. L. Melander. 



Type from Moscow Mountain; allotype from Bovill; both are in 

 the collection of A. L. Melander. 



No. 9. DOLICHOPUS NIGRICAUDA, new species. 



Male. — Length 5 mm.; of wing 4-4.3 mm. Face nearly as wide 

 as the front, silvery white, a little yellowish just below the antennae. 

 Front shining green vAih. blue or coppery reflections. Antennae 

 wholly black; third joint small, about as long as wide, a little pointed 

 at tip. Lower orbital cilia silvery white, the lower cilia flattened, 

 scale-like, the black cilia reaching down to about the middle of the eye. 



Thorax green with blue and bronze reflections, shining: pleurae a 

 little dulled with white pollen. 



Abdomen green with blue and bronze reflections, usually the 

 apical segments more coppery, very bright and shining, no white 

 pollen on its sides. Hypopygium black; its lamellae (fig. 9a) large, 

 nearly as long as the hypopygium, the wide central portion a little 

 longer than wide, somewhat orbicular, with the narrow stem at 

 base and a narrow rounded projection at apex fringed with long 

 blackish hairs, which are longest at tip of the projection. 



Coxae, legs, and feet black, knees a very little yellowish. Fore 

 coxae covered with silvery pollen and with a few minute white 

 hairs on the anterior surface. Middle and hind femora each with 

 one preapical bristle, the latter without cilia below. Hind tibiae a 

 little thickened, the glabrous stripe on upper surface can be seen as a 

 shining line between the rows of large bristles. Fore tarsi a little 

 longer than their tibiae, plain, the first joint scarcely as long as the 

 three following joints taken together. Middle tarsi one and a third 

 and hind tarsi one and a half times as long as their tibiae. Calypters, 

 their cilia and the halteres yellow. 



Wings (fig. 9) grayish; costa scarcely enlarged at tip of first vein, 

 but when viewed from in front it shows a little flattening of the costa 

 with a little bristle-like point at outer end on the lower surface of 

 wing; last section of fourth vein considerably bent at its middle; 



