THE DIPTEEOUS GENUS DOLICHOPUS IN NORTH AMERICA. 267 



somewhat elliptical, nearly twice as long as wide, w^hitish mth a 

 black border, which is wade on apical and narrow on upper margin, 

 jagged and bristly at lower apical corner, otherwise fringed with 

 delicate black hairs. 



Fore coxae yellow with conspicuous black hairs on their anterior 

 surface and a blackish spot at base on outer side. Middle and hind 

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

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

 without cilia below, the black hairs on their sides reaching the lower 

 edge, leaving only a narrow glabrous line below. Middle tibiae 

 with three bristles below, two near apical and one near basal third, 

 their basitarsi without a bristle above. Posterior tibiae a little 

 thickened; the usual glabrous stripe on upper surface distinct, but 

 somewhat broken; their inner surface sometimes with a brownish 

 streak just inside of the inner row of large bristles near the middle.. 

 Fore tarsi (fig. 195a) about one and one- third times as long as their 

 tibiae; first three joints slender, yellow, second about half as long as 

 first, third half as long as second; fourth joint nearly as long as 

 third, a little widened, as wide as long, yellowish with a black tip, 

 sometimes mostly blackish; fifth joint black, much compressed, 

 about as long as second and third taken together, fully two-thirds as 

 wide as long, somewhat oval but straight below, fringed on upper 

 edge with black hairs. Middle and hind tarsi one and a third times 

 as long as their tibiae, black from the tip of the first joint. Calypters 

 and halteres yeUow, the former with black cilia. 



Wings (fig. 195) grayish, usually tinged with yellowish or brownish 

 in front of third vein; costa with an enlargement, commencing be- 

 fore the tip of first vein and gradually tapering; last section of fourth 

 vein bent just before its middle; third vein bent backward a little 

 at its tip ; hind margin of wing scarcely indented at tip of fifth vein ; 

 ^ving of rather equal width, the anal angle being prominent. 



Female. — Face wide; third antennal joint shorter than wide; 

 coxae and legs as in the male; fore tarsi plain, a little longer than their 

 tibiae; fifth joint slightly longer than fourth; wing as in the male, 

 except that the costa is not enlarged and the hind margin is more 

 rounded, making the wing wider. 



Redescribed from numerous specimens. J. M. Aldrich has taken 

 it at Friday Harbor, Washington, May 28-July 14; Dewatto, Wash- 

 ington, June 7; Puyallup, Washington, June 17; and Mount Consti- 

 tution, Orcas Island, Washington, July 7. A. L. Melander has taken 

 it at several places in Washington, May 23-August 7 ; Hood River , 

 Oregon, June 30; Salem, Oregon, July 4; Clayton and Abbotsford, 

 British Columbia, August 9. H. S. Barber took it at Eureka, Cali- 

 fornia, June 3, and Fieldbrook, California, May 31. 



Type locality. — State of Washington. 



