AMERICAN DIPTERA. 317 



extending from the prothorax, a large spot confluent with it on each 

 side in front of the transverse suture, the entire dorsum behind the 

 suture and the scutellum, with a very thin blackish bloom nowhere 

 wholly obscuring the polished black ground color. Abdomen wholly 

 polished black, nearly bare, the pile of the tergum microscopic and 

 sparse, that of the sides, especially of the first segments and on the 

 venter, longer. Femora polished black, the tibiae and tarsi reddish; 

 pile of legs white, the long fine hairdike bristles of the under side of 

 femora, and many on the tibias, white, the remaining bristles of the 

 tibiae and tarsi black. Halteres sordid white. Wings pure hyaline, 

 veins black, brownish toward base; venation normal. 



Type. — University of Kansas. Two female specimens. 



Habitat. — -Type locality, Clark Co., Ks. (May, elev. 1,692 

 ft., F. H. Snow). 



I have named this species in honor of Dr. F. H. Snow, Chan- 

 cellor and Professor of Entomology and Zoology at the Uni- 

 versity of Kansas, through whose kindness I was able to study 

 this species. 



Holopogxm umbrinus n. sp. 



9- — Length 6.5 mm. — Wholly black, polished, very pilose; the pile 

 of body almost wholly dark brown, dense on the venter of abdomen 

 from base to tip; wings dusky. 



Wholly black, polished, very pilose. Face and front only grayish 

 pruinose, wholly clothed with black pile, on the ocellar tubercle with 

 a few paler hairs. Occiput with dense black pile, only narrowly below 

 and on the base of the proboscis with white pile. Sides of prothorax, 

 the coxas and a small patch on the sides of the first abdominal seg- 

 ment with white pile; legs with some scattering white pile. Pile of 

 body and legs elsewhere dark brown, extremely dense on the scutellum 

 and on the sides and venter of the abdomen, — much denser and longer 

 than on any of the other species. In the male of seniculus the pile is 

 fully as dense on segments 1—3 of the abdomen, but it does not continue 

 thus to the tip of the abdomen as it does in umbrinus. Halteres lemon- 

 yellow. Legs black, the front and middle pair slightly pitchy. Wings 

 dusky hyaline. 



Type. — M. C. Z. A single female specimen. 



Habitat. — Webber Lake, Sierra Co., Cal. (July 25, O. Sacken). 



The above description refers to the Hopogon specimen men- 

 tioned by Osten Sacken in his Western Diptera, page 310. 

 The specimen is at the M. C. Z. and bears a label with the 

 specific name umbrinus, which I have retained. It is very 

 distinct from the other Holopogon species known to me. 



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



