DIPTERA 455 



tibiae more sparsely covered with long black ones, hind and middle 

 femora destitute of bristles, middle tibial each with two bristles on the 

 anterior and two on the posterior side, hind tibial each with two or 

 three on the anterior and two on the posterior side besides those at the 

 apices ; wings pale yellowish gray, changing to hyaline along the hind 

 margin, crossveins not clouded with brown ; calypteres white ; length 

 8 to lo mm. Two males and one female. 



Habitat. — Kukak Bay, July 4 ; Popof Island, Alaska, July 9. 



Type. — Cat. no. 5252, U. S. National Museum. 



The U. S. National Museum also possesses a male specimen col- 

 lected at Port Chester, Alaska, by Professor H. F. Wickham. 



Pogonota kincaidi sp. no v. 



Male : Black, the front on lower part, in the middle almost reaching^ 

 the ocellar triangle, face, cheeks, antennae, palpi, halteres, anterior 

 portion of front coxae, and the legs, yellow ; third joint of antennae 

 three times as long as the second, arista bare, vibrissae and the bristles 

 and hairs along lower side of head yellow, hairs on lower side of occi- 

 put extremely sparse ; a velvet-black, H-shaped spot near center of 

 front ; body slightly polished, thinly grayish pruinose, hairs on dorsum 

 of abdomen very short except a fringe of long black ones near hind 

 margins of the fourth, fifth, and sixth segments ; end lamellae of hypo- 

 pygium each slightly longer than wide, directed upward, the apex 

 fringed with long pale yellow hairs which curve over the back ; in 

 front of the hypopygium is a pair of ventral processes which, near 

 the middle of the anterior side, send forth an anteriorly directed, com- 

 pressed, obliquely truncated lobe, beyond which the main process is 

 strongly bent backward, but curves slightly forward toward its apex ; 

 front femora greatly swollen, considerably narrowed toward the apex 

 of the under side, bearing many very short, black bristles on the under 

 side of the thickened portion and on the inner side of the front tibiae ; 

 wings whitish hyaline, a pale brownish vitta in the middle, most pro- 

 nounced beyond the small crossvein, second basal cell slightly widen- 

 ing toward the apex, crossvein at base of discal cell almost perpendic- 

 ular, hairs along the costa extremely short ; calypteres whitish. 



Female : Differs from the male as follows : Yellow of front extends 

 above lowest ocellus, third joint of antennje black, proboscis yellow, 

 its apex brown, front coxae wholly yellow, vibrissae and two adjacent 

 bristles black, no velvet-black mark near center of front, abdomen not 

 pruinose, highly polished, destitute of long hairs and of ventral proc- 

 esses, depressed at base, strongly compressed at apex, ovipositor 



