THE DIPTEROUS GENUS DOLICHOPUS IN NORTH AMERICA. 281 



Fore coxae yellow with white pollen and minute white hairs on 

 anterior surface; middle and hind coxae black on the outside, yellow 

 on inner side and at tip. Femora and tibiae yellow. Middle and 

 hmd femora each with one preapical bristle, the latter ciliated with 

 white hairs on lower inner edge for their entire length, the longest 

 being near the tip and about three-fourths as long as width of femora. 

 Middle tibiae with one bristle on lower anterior edge near apical 

 third, their basitarsi without a bristle above. Posterior tibiae a 

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

 but nearly broken near the tip and widening again at apex of tibia, 

 their inner surface with a glabrous spot near the base which is usually 

 darker yellow than the rest of the tibia. Fore tarsi one and three- 

 fourths times as long as their tibiae, first three joints yellow and of 

 nearly equal length; first joint normal, second and third very thin 

 and with their sides glabrous, third sometimes brownish; fourth joint 

 white, a little longer than the width of the tip, somewhat triangular, 

 and with two or three long hairs above; fifth joint much compressed, 

 somewhat orbicular in outline, but straight below, about one-third 

 as long as the third. Middle tafsi about one and a fourth times 

 as long as their tibiae, brownish yellow, becoming darker toward 

 their tips. Hind tarsi black from the tip of the first joint, which is 

 dark yellow. Calypters and halteres yellow, the former with black 

 cilia. 



Wings (fig. 206) grayish; costa with a small elongated enlargement 

 at tip of first vein; last section of fourth vein bent just before its 

 middle; third vein bent backward at tip; hind margm of wing 

 indented at tip of fifth vein, nearly evenly rounded, the anal angle 

 being rounded, not at all prominent. 



Female. — Agrees with the male in general color of all parts, in 

 having thick pollen on the mesonotum, and in the form of the wings, 

 except that the costa has no enlargement. Face about twice as 

 wide as in the male, third antennal joint shorter; fore tarsi plain, 

 a little longer than their tibiae, first joint about as long as the two 

 following taken together, third a little shorter than second, fourth 

 and fifth of about equal length, and each about half as long as second, 

 first four jomts dark yellow, only the fifth black; hind tibiae scarcely 

 thickened and without the glabrous spot on inner surface. 



Redescribed from numerous males and females from California, 

 taken m Sonoma, Alameda, Marin, and San Mateo Counties, May to 

 November. 



Type locality. — California, the San Francisco region. 



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

 chusetts, 



