THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 149 



pointed at tip. Lateral and inferior orbital cilia pale, about five of 

 the upper cilia on each side black. 



Thorax shming green with coppery reflections on the anterior part 

 of the dorsum where there is a little white pollen ; pleurae dulled with 

 whitish pollen. Abdomen green with black incisiu-es and considerable 

 white pollen, which is more conspicuous along the sides. Hypopv- 

 gium black; its lamellae moderately large, somewhat oval in outlme^ 

 white with a narrow black border, jagged and bristly at apex. 



Fore coxae yellow with a small blackish spot at base on outer side, 

 anterior surface with little black hairs on umer edge and sometimes 

 at base and mmute yellow hairs on outer edge. Middle and hind 

 coxae black with yellow tips; sometimes the posterior pah- are yellow 

 on umer side. Femora and tibiae yellow. Middle and hmd femora 

 each with one preapical bristle, the huid ciliated with delicate yellow 

 hairs on the lower uiner edge, these hairs about half as long as the 

 width of the femora. Posterior tibiae black at tip, slightly thickened ; 

 on inner surface there is a glabrous stripe mside of the inner row of 

 large bristles which near the base covers almost the whole width of 

 the tibia. Fore tarsi nearly one and a half times as long as their 

 tibiae, uifuscated from the tip of the first joint, first, and second joints 

 taken together nearly as long as the tibiae, second about half as long 

 as first and a little longer than third; fourth and fifth of nearly equal 

 length, each being a little shorter than the third, still the fifth is a 

 little the shortest. Middle tarsi a little more than one and a fourth 

 times as long as their tibiae, black from the tip of the first jomt, which 

 is without a bristle above. Hmd tarsi wholly black. Calypters 

 and halteres yellow, the former with black cilia. 



Wings (fig. 101) tinged with gray; costa scarcely enlarged at tip of 

 first vein; last section of fourth vein a little bent some distance 

 beyond its basal third; hmd margin of wing scarcely indented at tip 

 of fifth vein, rather evenly romided, the anal angle being rounded, 

 not very prominent. 



Female. — Face wide, white; fore tarsi not or but little longer than 

 their tibiae, and with the fifth joint a little longer than the fourth; 

 otherwise about as in the male. Middle tibiae with one bristle below, 



Redescribed from the type specunens and 7 males. Two of the 

 latter were taken at Ithaca, New York; 1 at Golden, Erie County, 

 New York, July 23; 1 at Niagara Falls, Ontario (Van Duzee), July 

 20, and 2 at Turkey Run, Indiana (Aldrich), August 20, 1918. 



Typelocality . — Trenton Falls, New York; the type of pZaiyrosopws was 

 from Hudson Bay Territory. Chagnon reports it from Montreal, Que- 

 bec. Insects of New Jersey, from Merchantville, New Jersey, Jmie 28. 



Synonymy by Aldrich, Catalogue, 1905, from types. 



Types. — In Museum of Comparative Zoology, Cambridge, Massa- 

 chusetts. 



