AST 11. NOTES ON- NEARCTIC BIBIONID FLIES — McATEE. 15 



tensively obscured with darker; spurs of front tibiae rufous, very 

 unequal ; wing and veins dusky f umose, darker costally. Length of 

 wing, 6 mm. 



The female also, according to Williston, is chiefly black pilose, 

 thus differing from most of the species of Bibio, and has the coxae, 

 except front ones in part, black. 



A male collected in the Graham Mountains, Arizona, at an alti- 

 tude of over 9,000 feet, June 3-6, 1914, by E. G. Holt is assigned to 

 this species. 



BIBIO VARIABILIS Loev. 



BiMo variaMlis Loew (H.), Dipt. Amer. sept, indig., Cent., 5, No, 7, 

 1864, Compl. Work, pp. 215-6 [Sitka; New Hampshire]. 



Mcde. — Head, body and coxae black, clothed with long hair vary- 

 ing from gray to black, chiefly the former on abdomen, pleura, and 

 legs, and the latter on top of thorax and on occiput; sometimes 

 wholly black pilose; femora black, the mid and hind pairs often 

 rufous near bases (all of them sometimes almost entirely rufous) ; 

 tibiae and tarsal joints rufous basally, dark apically, the subequal 

 spurs of front tibiae rufous; wings hyaline, anterior veins and 

 stigma brown. 



Female. — The female differs in having much shorter wholly pale 

 hair, all leg joints rufous with dark tips (coxae sometimes dark at 

 base or even wholly black) , and the wings fumose. 



Length of wing, 6-10 mm. 



Specimens examined were all collected along the northwest coast 

 of North America from Corvallis, Oregon, to Yakutat, Alaska. The 

 species has been recorded also from Quebec. 



BIBIO VESTITUS Walker. 



Bibio ve^tita Wai^keb (Francis), List. Dipt. Britisii Mus., pt. 1, 1848, p. 

 122 [Nova Scotia]. 



Head, body, and legs black, clothed with black hairs, abundant 

 and long over head, body, coxae and femora, shorter on remaining 

 joints of legs; tibiae and tarsal joints rufous with dark tips, the 

 last two joints of tarsi almost or wholly dark; front tibiae reddish- 

 brown, the spurs very unequal; wings nearly hyaline, stigma and 

 anterior veins brown, the cells bounded by latter more obscure than 

 remainder of wing, posterior veins almost hyaline. Length of wing, 

 7 mm. 



A male collected at St, John, New Brunswick, June 9, 1901, W. 

 Mcintosh, is identified by Coquillett as vestitus and probably is 

 that species; the original description does not mention the front 

 tibial spurs. 



