OSTE^ SACKEN ON WESTERN DIPTERA. 305 



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

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

 einargination 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 mm . 



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. — The cross-bands of 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 

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

 l are somewhat reddish toward the end. Length 10-12 mm . 



10. Cyrtopogon profusus n. sp., $ 9 . — Thorax, including its sides 



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



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



1 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- 



1 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 pleurae 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. Antennae 



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



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



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



tibiae 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, ll-12 mm ; female, 12-13 mm . 



Hab. — Morino Valley, New Mexico, July 1 ( W. L. Carpenter) ; Sangre 



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



I 

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