THE DIPTEEOUS GENUS DOLICHOPUS IF NORTH AMERICA. 159 



below, but with the little black hairs on the sides reaching the lower 

 edge. Middle tibiae with their tips a little enlarged and black, also 

 with a preapical brown ling, between which and the black of the tip 

 is a glabrous, shining, white spot on their upper side. Hind tibiae 

 only slightly thickened, blackish at tip, especially below; the gla- 

 brous stripe on upper surface distinct, but broken by a few hairs and 

 not reaching either base or tip; inside of the inner row of large 

 bristles there is also a narrow glabrous line, which is widest taward 

 the base and reaches the tip, but is broken by a few little hairs where 

 the iufuscation of the tip begins. Fore tarsi about equal to their 

 tibiae in length, black from the tip of the first joint, which is about as 

 long as the three succeeding joints taken together, fifth a little shorter 

 than the fourth. Middle tarsi about equal to their tibiae in length; 

 last three joints distinctly, although only slightly, compressed, black; 

 first joint black at base and tip, yellow in the middle. Hind tarsi one 

 and a third times as long as their tibiae, black from the tip of the first 

 joint, rather stout, almost imperceptibly compressed; first joint 

 sometimes blackened at base below and furnished with but two large 

 bristles above. Calypters and halteres yellow, the former with black 

 cilia. 



Wings (fig. 109) grayish, tiaged with brownish in front and along 

 the veins; costa not enlarged at tip of first vein ; last section of fourth 

 vein bent near one- third its length; third vein bent backward a little 

 at tip: hind margin of wing scarcely indented at tip of fifth vein, 

 from this point to the tip of sixth vein is a deep bisinuate excision 

 wnich leaves a prominent lobe at anal angle. 



Female. — Face wide and short, alm.ost brown; arista about normal, 

 its basal joint being about one-third of its length; front green or 

 blue-green; middle tibiae yellow with the tip slightly enlarged and 

 tinged ^vith brown; there is a smail glabrous spot on upper side at 

 about basal third; middle tarsi ver}'^ slightly compressed; all tarsi 

 black from the tip of the first joint; hind tibiae only slightly brownish 

 at tip and without any glabrous line inside of the inner row of bristles; 

 wings rather broadly and evenly rounded on their posterior margin; 

 anal angle prominent. 



Redescribed from 4 males and 10 females taken by J. M. Aldrich 

 on the top of Mount Constitution, Orcas Island, Washington (2,400 

 feet), July 7, 1905, and July 17, 1909; 1 male taken at Ilwaco, 

 Washington, eJuly, 1917, by A. L. Melander; and 1 male and 2 females 

 taken at Eureka, California, May 22 to June 6; R. P. Currie took a 

 female at Kaslo, British Columbia, June 10. 



Type locality. — Sitka, Alaska. J. M. Aldrich reports it from 

 Mount Hood, Oregon. 



