THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 207 



Described from 1 male taken at Hood River, Oregon, July 4, 1917, 

 by F. R. Cole. 



Type.— Male, Cat. No. 23038, U.S.N.M. 



No. 148. DOLICHOPUS WALKERl, new species. 



Male. — Length 4.5-5.5 mm. ; of wing 4.5-5 mm. Face rather wide, 

 a little narrowed below, yellowish. Front green with bronze reflec- 

 tions. First antennal joint yellow with the upper edge black; second 

 and third black, the latter longer than wide, somewhat oval, a little 

 pointed at tip. Proboscis black; palpi yellow. Lateral and inferior 

 orbital cilia pale yellow, about six of the upper cilia on each side 

 black. 



Thorax green with bronze reflections ; dorsum dulled with yellowish 

 gray pollen, which becomes more gray along the front edge ; pleurae 

 dulled with white pollen. Abdomen green with coppery reflections; 

 the white pollen on its sides abundant and extending upon the 

 dorsum. Hypopygium black; its lamellae large, fully twice as long 

 as wide, somewhat oval, white with wide black border on apical 

 margin, jagged and bristly at apex, fringed above with little black 

 hairs, below with a few pale hairs. 



Fore coxae wholly yellow or nearly so, their anterior surface 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 not ciliated below. Posterior tibiae but 

 little thicker than the others, not or scarcely at all infuscated at tip. 

 Fore tarsi (fig. 148a) one and a fourth times as long as their tibiae; 

 first thi-ee joints yellow, first about equal to the three following joints 

 taken together, second joint three-fom'ths as long as first, third half 

 as long as second or sometimes more, fourth black, about one-third 

 as long as third, a little compressed, as wide as long, fifth joint 

 black, compressed, a little longer than third, somewhat oval, nearly 

 straight below, obliquely truncate at tip, the apex extending beyond 

 the claws; pulvilli white, cousipcuous. Middle tarsi a little longer 

 than their tibiae, black from the tip of the first joint, which has a 

 large bristle above, their tibiae with three, sometimes four bristles 

 below, one pair at apical third and one or two bristles before them. 

 Hind tarsi wholly black. Calypters and halteres yellow, the former 

 with black cilia. 



Wings (fig. 148) grayish; costa without an enlargement at tip of 

 first vein; last section of fourth vein bent beyond its basal third; hind 

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

 prominent. 



Female. — Nearly as in the male, except that the face is wider and 

 grayish white; the fore tarsi are plain, a little longer than their tibiae, 

 first joint as long as the remaining joints taken together, blackened 



