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Show 206 .. Utah Academy of Sciences, Arts and Letters [Vol. XIV; Museum; two paratypes returned to Mr. T'ing ; three paratypes deposited in the Utah State Agricultural College collection and two paratypes deposited in the Brigham Young University collection. Bibio nigrifemoratus, new species Male.-Head, body (except pale humeral ridges), coxae trochanters and (for the most part) black; posterior and mid-femora chiefly black or brownish red, usually slightly rufous apically; front femora with a longitudinal strip of rufous down their middles; front tibiae rufous, except femora for darkened portion at the base of the spurs, mid and hind tibiae and joints rufous, slightly darker apically, other tarsal segments brownish. Inner spurs of front tibiae very short, being but one-fifth to one-fourth the length of the outer; posterior femora and tibia clavate, the latter slightly thicker; pos terior basitarsi not swollen and two times as long as next segment. Pile of eyes and occiput copious, black, that of face gray to black; dorsum of thorax with long, black pile, intermixed with yellow, in a few cases the yellow pile is predominant; pile of abdomen gray to black anteriorly, yellow posteriorly, genitalia with long, yellow pile; pile of pleura, coxae and femora yellow to gray; that of tibiae and tarsi brown, with yellow hairs intermixed. Wings hyaline to slightly yellow fumose, or dusky, anterior veins and stigma dark brown, posterior veins light brown to yellowish gray; r-rn cross-vein one half to equal in length to the basal part of the Rs. Female.-The female differs in having all pile short and yellow, all femora yellow to rufous, anterior coxae slightly so, and the wings more dusky yellow fumose. Length of wing, 5-5.5 mm. Type.-Holotype, male, Monte Lake, British Columbia, 13-v-1936, (J. K. Jacob). Allotype, female, same data. Twelve paratypes; one female, two males, same data as holotype; one female and three males, Rochester, Wash ington, I1I-30-1932, CW. M. Baker); two males, Kiger Island, Oregon, IV8-36 0. Wilcox); three males, Meachame, Cr., Elev. 368 ft., May 8, 1927, H. A. Scullen), and one male, Pullman, Wash., April 23, '08, (G. I. Reeves). Holotype, allotype and one paratype returned to Mr. J. K. Jacob, (to be deposited in the Canadian National Museum at- Ottawa, Quebec), five specimens returned to Mr. J. Wilcox, one returned to the University of Utah, and six deposited in the Brigham Young University collection. Bibio nigrifernoratus gilvus, new variety dorsum entirely yellow with This variety differs in having the pile of black hairs intermixed, that of the pleura, coxae, femora and abdomen Femora some Hairs of tibiae and tarsi reddish brown. gray to yellow. rufous to of times with slight tinges apically. yellow the no Female unknown. Type._jHolotype, male, Ogden, Utah, 5-1-37, (G. F. Knowlton and F. C. One paratype, male, Hyrum, Utah, 5-4-37, (Knowlton and Harmston). Harmston) : one male Zion Nat. returnd to Dr. Knowlton; type Utah and the Park, Utah, (A. M. Woodbury). one paratype retu:ned. Hole University of collection, to the retained in the Brigham Young University but ranges of these two varieties are quite widely separated one doubt future collecting will bring them more closely together. no |
