OSTEX SACKEN ON WESTERN DIPTERA. 305 



which agree perfectly with Mr. Laew's description, except that the 

 grayish-pollinose cross-bands on segments 2-4 have a distinct black 

 emargination in the middle, which is not mentioned. The third anten- 

 nal joint is sometimes reddish ; the antennal style is long, still I would 

 not call it longer than half of the third joint. The thorax of my speci- 

 mens shows, on each side of the median stripe, anteriorly, a short streak 

 of whitish pollen. Length 4-10'>i°i. 



I will supply a short description of the female, of which I have three 

 specimens, taken on the same day with the males ; a fourth is from 

 Sonoma County, end of April. 



Female. — Thecross-bandsof whitish pollen on segments 2-4 are nearly 

 parallel, slightly narrower in the middle, especially on the fourth seg- 

 ment, where they are more expanded on the sides ; on the fifth segment, 

 the cross-band is interrupted in the middle. The pile on the sides of the 

 abdomen is white, with the exception of a tuft at the base of the first 

 segment on the sides, and of a smaller one on the sides of the second seg- 

 ment. The prevailing pubescence on the tarsi is black ; the white hairs 

 on the hind tarsi, which are conspicuous in the male, are wanting here. 

 The brownish on the distal part of the wings is much less distinct than 

 in the male, hardly perceptible. The antennae of one of the specimens 

 are somewhat reddish toward the end. Length 10-12°"". 



10. Cyrtopogon profusus n. sp., $ ? . — Thorax, including its sides' 

 and corners, and scutellum, densely clothed with gray pollen ; three 

 brown stripes on the dorsum ; the intermediate one geminate, reaching 

 from the anterior border to the scutellum (where it becomes almost 

 black), longitudinally bisected by a gray line; the lateral stripes broad, 

 abbreviated anteriorly, and bisected transversely by a gray line along 

 the thoracic suture ; the two halves thus produced are about equal in size, 

 the anterior one being nearly round ; both are dark brown on their inner 

 side ; the hair on the dorsum is black ; a fringe of black hairs along the 

 edge of the scutellum. Abdomen black, shining ; posterior margins of 

 segments 1-5 with a moderately broad cross- band of white pollen ; in the 

 male, the segments preceding the hypopygium are also whitish-polli- 

 nose ; the sides of the abdomen on the basal half have tufts of long, 

 soft, white hair ; the fan-like fringe of hairs on the pleurss in front of the 

 halteres is white. Hypopygium beset with some black pile. Face and 

 front brownish-gray, beset with black pile; in the female, I perceive 

 some white hairs mixed with the black ones in the mystax. Anteunse 

 black. Legs brownish-red ; femora with black stripes along the upper 

 side; they are beset with long, soft, white hairs; tibise with short white 

 pile and black bristles, a few of the bristles on the middle and hind 

 tibia3 are pale yellow ; tarsi reddish-brown, almost black on the upper 

 side ; ungues whitish, with black tips ; pul villi whitish. Wings grayish- 

 hyaline; venation normal. Length, male, 11-12°"'^; female, 12-13"'°. 



Hah.— lAovmo Valley, New Mexico, July 1 ( W. L. Carpenter) ; Sangre 

 de Cristo Mountains, July (the same). One male and three females. 



