328 ERNEST A. BACK. 



ually to the apex, the style two- thirds as long as the third segment. 

 Thorax gray and golden pruinose, the pile short, sparse, mixed black 

 and white; pleurae gray pruinose, its pile and that of the coxae white, 

 the fan-like pile in front of the halteres also white. Pile of abdomen 

 sparse, microscopic, light colored; that on the lateral margins and 

 venter whitish. Pile of legs sparse, whitish, that on tarsi and tips 

 of tibiae largely black. Wings smoky-gray, all posterior cells and the 

 anal cell open. 



The male is the same as the female except that the middle femora 

 have each a cluster of black pile at its apex in front and two similar 

 fringe-like clusters, one on the upper, the other on the lower, surface 

 at its last third, and above the middle of each middle tibiae are two 

 long dense fringes of black pile on its inner and outer sides, connected 

 with each other in front; front metatarsi destitute of appressed white 

 pile." 



Type.—V. S. N. M., Cat. No. 926. Type seeries consits of 

 four female and one male specimen. 

 Habitat. — Los Angeles Co., Cal. (type). 

 I have no specimens of this species. 



Heteropogon senilis. 



Anisopogon senilis Bigot, Annales, 1878, 423. 



$. — Length 13 mm. — Translation. — Blackish; antennae black; face, 

 hair of face, front and occiput grayish ; beard white; mystax, hair of 

 palpi and occipito-orbital bristles black. Thorax grayish ; pleurae, 

 trochanters and femora beneath with white pile ; venter with pale 

 yellow pile. Abdomen and femora black; tibiae reddish; middle tibiae 

 with a black brush, hind tibiae annulate with black; the middle femora 

 below toward the tip with a dense black tuft of hair; tarsi reddish- 

 brown at apex; wings hyaline. 



Dark brownish-black; antennae black; pile of upper part of the 

 mystax, face and hairs of the occiput, grayish; beard white; pile of 

 palpi, oral margin, some of the bristles of the vertex and occiput, black. 

 Thorax gray with grayish pubescence, the hairs white; long and thick 

 on the pleurae, coxae and the outside of the femora. Abdomen black, 

 glabrous above, with long yellowish hair beneath. Femora black, the 

 middle pair with a tuft of short hairs, very compact, black on the 

 outside near the tip; tibiae tawny, with whitish pile and black bristles, 

 the hind pair black near the middle as well as toward the tip, the 

 middle pair on the front side near the middle with a brush of hairs 

 similar and corresponding to those of the femora; tarsi tawny, brown- 

 ish toward tip. Halteres pale testaceous. Wings hyaline, veins 

 brownish. Genitalia of male very small. 



Type. — Bigot collection. 



