AMERICAN DIPTERA. 197 



often covers the entire anterior as well as the upper surface; tibiae 

 and tarsi wholly reddish-yellow; the legs wholly clothed with, and the 

 ground color partially concealed by, closely appressed dull yellow 

 hair; the bristles entirely sordid white. Face and occiput light yellow 

 pruinose; the palpi and proboscis black; bristles of face, palpi, pro- 

 boscis, lower occiput and coxa; pale straw-colored, those of the an- 

 tennae, vertex, upper occiput and dorsum more yellowish. Entire 

 prothorax with thick bristles, pale straw below, more golden above. 

 Mesonotum blackish, the humeri reddish; the hairs on the anterior 

 portion short, pale; dorsum otherwise as above described. Scutellum 

 with pale bristles. Abdomen of male blackish, the genitalia and the 

 posterior lateral margins of the segments obscurely reddish, venter 

 reddish; the color of the abdomen partially obscured by the bloom 

 and close lying dull yellowish pile. Wings hyaline, veins brownish, 

 the costa and veins at base yellowish; the first and fourth posterior 

 cells open. 



Type.—M.. C. Z. 



Habitat.— Cal. (type); Pasadena Cal. (J. M. Aldrich). 



Stenopogon nijjTitulus. 



Stenopogon nigritulus Coquillett, Proc. Ent. Soc. Wash., VI, 

 179, 1904. 

 (J 1 9- — Length 10-13 mm. — Black; the head and thorax rather 

 densely, the abdomen more thinly, grayish- white pruinose; the bloom 

 of the thoracic dorsum more brownish, with traces of a median gem- 

 inate stripe. The first two segments of the antennas, halteres, genitalia 

 and legs, except the coxas, and a vitta on each femur, reddish-yellow; 

 the hairs and bristles of entire body and legs whitish. The third seg- 

 ment of the antennae comparatively short, more oval and hardly three 

 times as long as the bristle-like style. Mesopleura and hypopleura bare, 

 the mesopleura without a tuft of long soft pile, but with a very small 

 amount of inconspicuous pile. Wings hyaline, veins brown, the first 

 and fourth posterior cells broadly open. 



Type.— U. S. N. M., Cat. No. 7949. Three male and four 

 female specimens collected by Mr. D. W. Coquillett. 



Habitat. — -Los Angeles and Kern Counties, Cal. (July, type) ; 

 S. B. Mts., Cal. (July 28, W. M. Wheeler). 



Stenopogon albibasis. 



Stenopogon albibasis Bigot, Annales, 1878, 422. 



$. — Length 12 mm. — Translation. — Fulvous, third segment of the 



antennae black, face black; palpi black with whitish pile; mystax and 



beard whitish. Thoracic stripe geminate, abbreviated posteriorly and 



on both sides with a large black oblong spot; pectus black, halteres 



TRANS. AM. ENT. SOC, XXXV. JUNE, 1909. 



