228 KANSAS UNIVERSITY QUARTERLY. 



Chilosia sororcula "Will. 



Described from males alone. The female differs in its shorter pile, 

 jnore shining abdomen, and in a greater extent of yellow on the legs. 

 Front about one-fourth of the width of the head, horizontally grooved 

 above the antennre; the abdomen wholly shining, except for a poorly 

 defined opaque spot on the middle of the second segment. 



More than one hundred specimens. Hop Canyon, Magdalena 

 mountains, N. M. (August, 80008500 ft.). A southern form, first 

 described from Mexico. 



Chilosia petulca Will. 



A single female, Colorado (Gillette, No. 687) is undoubtedly this 

 species. The length is 7 mm. The wings are hardly more yellow at 

 the base than elsewhere. Known hitherto from Washington (state). 



Ohilosia tarda, n. sp. 



Male. Black, shining, somewhat metallic. Fron tal triangle fossulate, 

 very large, at its widest a third the width of the head, longer than the 

 ocular line of contiguity, hardly shining, covered with yellowish 

 cinereous pollen and long black pile. Antennae small, reddish, third 

 joint rounded; arista feebly pubescent, black. Face with sparse 

 light pile along the orbits, and light pollen which is thickest just 

 beneath the antennae; a long rather shallow concavity above the 

 tubercle and a very short abrupt one beneath it; tubercle more 

 prominent than the antennal projection of the front. Eyes bare. 

 Thorax and scutellum with long light pile, the latter without bristle- 

 like hairs. Abdomen with long light colored pile, shining metallic 

 black; first segment, second segment, except the lateral margins, and 

 a large irregular posterior spot on the third segment, opaque. Legs 

 black, tip of femora, base and tip of tibiae, and basal joints of four 

 front tarsi, yellowish red. Wings cinereo-hyaline. — Length 5.5 mm. 



One specimen, Colorado (Gillette, No. 1556). 



This species differs from C. sororcula Will, in its much larger 

 frontal triangle, smaller antennae, and in the abdominal characters. 



Chilosia lucta, n. sp. 



Female. Black, shining. Front plane, beset with very short, 

 light colored pile. Antennae velutinous black; arista black, incrassate 

 for half its length, pubescent. Face shining black, very lightly pol- 

 linose beneath the antennae; orbital pile white, very sparse and weak; 

 the lower half of the face strongly produced, projecting beyond the 

 antennal prominence; well defined concavities above and below the 

 tubercle. Eyes bare. Pile of thorax short, seen from before yellow. 



