ABTll. NOTES ON NBARCTIC BIBIONID FLIES — McATEE. 9 



often rufous-tipped, hind legs moderately elongate, the femora and 

 tibiae clavate, the first tarsal joint more than twice as long as 

 second ; wings whitish hyaline, stigma and all veins dark, the latter 

 pale toward base of wing. 



Female. — The female frequently has the body color reddish brown 

 to brownish black and differs otherwise by having shorter, all pale 

 hair on head and body (vestiture of legs does not differ) ; hind tibiae 

 not clavate ; wings somewhat duskier. 



Length of wing, 5-9.5 mm. 



BIBIO ALBIPENNIS HIRTUS Loew. 



Bihio hirtus Loew (H.), Dipt. Amer. Sept. indig., Cent. 5, No. 2, 1864, 

 Compl. Work, p. 213 [California]. 



Similar to albipennis in every way, the only distinction being the 

 more copious and longer hair, especially prominent in the case of 

 males. 



Individual eastern specimens may be practically as hairy as even 

 Pacific coast flies, and specimens approaching hirtus seem to prevail 

 in intermediate localities as Colorado and New Mexico. 



The range of the w^estern moiety of the species {hirtus) includes, 

 on the basis of specimens examined, Idaho and the Pacific States 

 from Orcas, Washington, to Pasadena, California, and the eastern 

 subspecies {albipemiis) from the Dakotas and Quebec south to 

 North Carolina and Oklahoma. 



BIBIO BASALIS Loew. 



Bibio lasalis Loew (H), Dipt. Amer. sept, indig., Cent. 5, No. 11, 1S64 

 Compl. Work, p. 217 [New Hampshire]. 



Female. — Head and body black wdth short pale reddish hairs, 

 coxae rufous the posterior ones obscured by darker, femora rufous, 

 dark-tipped, front tibiae shining black with rufous subequal apical 

 spurs, other tibiae rufous, tipped and more or less overlaid by 

 black; tarsi chiefly dark, each joint pale basally; wings and veins 

 dusky fumose darker costally. Length of wing, 5.5 mm. 



A female collected at Manning, South Carolina, March 28-29, 1919, 

 by E. E. Kalmbach answers to the description of B. hasalis, except 

 in size, which is notoriously variable in the genus. 



BIBIO CRIORHINUS Bellardi. 



BiMo criorhinus Bellakdi (L.), Ditterologia Messlcana, pt. 1, 1859, p. 17 

 [Mexico]. 



Black except the subequal spurs of front tibiae, and the hind tibiae 

 and tarsi which are rufescent, and narrow bases of front tarsal 

 joints which are yellowish ; head, body, and coxae clothed with long 

 dark hairs; those of the rather elongate legs shorter. Length of 

 wing, 7 mm. 



