114 Journal New York Entomological Society. [Vol. xvi. 



palpi, apex of femora, tibice and tarsi cream-colored; apex of four posterior tibiae 

 and their tarsi infuscated. Wings subviolaceous ; nervures brown. 



Male. — Length 6.5 mm. In general resembles 9- Antennae 18-jointed ; outer 

 rays longer at base than apex, tapering to apex ; tarsal claw-tooth not as large as in 

 9 ; tibiae, tarsi and palpi not infuscated ; seventh ventral segment broadened at apex, 

 roughened rather unevenly. 



Habitat. — Rist Canon, Larimer Co., Colo. (C. P. Gillette). 

 Four 9 9 and 5 cTc? raised from larvae on Pinus scopulorum. Larvae 

 collected July 21, 1896, flies emerging October 1 to 3. 



This species is easily separated from other American species by the 

 nearly entirely black color in both sexes and other characters. The 

 c? has some resemblance to L. hypomelas but may be easily separated 

 by the more transverse head, shape of the seventh ventral segment, 

 color of legs, etc. 



