THE DIPTEROUS GENUS DOLICHOPUS IN NOPtTH AMERICA. 293 



size, somewhat elliptical, white or yellowish white with a black 

 border, which is broad on lower apical corner, jagged and bristly at 

 apex, fringed above with a few black hairs. 



Coxae, femora, and tibiae yellow. Middle coxae blackened on 

 outer surface; fore coxae with white pollen and delicate little white 

 hairs on anterior surface, and with a few small black hairs at base on 

 inner edge, which sometimes extend narrowly to the tip. Middle 

 and hind femora each with one preapical bristle, the latter ciliated on 

 lower inner edge with long yellow hairs, the longest of which are 

 longer than the width of the femora, these long hairs begin near the 

 middle of the femora and do not reach the tip, on the basal half of 

 the femora the hairs become much shorter and are very short toward 

 the base. Middle tibae with three bristles below, two near apical 

 and one near basal third, their basitarsi with one large bristle above 

 near apical third. Posterior tibiae but little thickened; the usual 

 glabrous stripe on upper surface distinct but not quite reaching the 

 base; inner surface largely glabrous; on apical fourth it is narrowed 

 to a line inside of the inner row of large bristles. Fore tarsi (fig. 215) 

 nearly one and a half times as long as their tibiae, first two joints 

 taken together nearly as long as the tibia, slender, yellow, second 

 joint two- thirds as long as the first; last three joints taken together as 

 long as the second, third with its basal half or more whitish, apex 

 black, scarcely widened, fringed on upper edge with long, dense, 

 black hairs; fourth and fifth joints taken together scarcely as long as 

 third, fourth slightly longer than fifth and a little wider, fringed 

 above with black hairs which are not as long as those on the third 

 joint. Middle and hind tarsi black from the tip of the first joint, 

 the former about one and a fourth times as long as their tibiae. 

 Calypters and halteres yellow, the former with black cilia. 



Wings (fig. 215a) grayish, slightly tinged with brown in front; 

 costa with a very slight enlargement at tip of first vein; last section 

 of fourth vein bent at right angles before its middle and with a 

 stump at the posterior bend; anterior bend usually rounded, very 

 rarely with a sharp right angle and a stump ; third vein bent backward 

 a very little toward the tip but usually running parallel with the 

 fourth at tip; hind margin of wing slightly indented at tip of fifth 

 vein, evenly rounded, the anal angle being rounded and not very 

 prominent. 



Female. — Face wider than in the male and more grayish, hind 

 femora without cilia; fore tarsi plain, a little longer than their tibiae, 

 the first joint about as long as the three following taken together, 

 fourth very slightly longer than fifth : hind tibae without the glabrous 

 surface on inside. 



Redescribed from numerous specimens from the following places: 

 Portland, Maine, July 9; Evanston, Illinois, July; Hancock, Mar}"- 

 land, May 29; Milbank, South Dakota; Lafayette, Indiana, June 11; 



