1923 ] 
The Genus Lasiopogon 
141 
slender, mostly shining, the hind margin of the segments narrowly 
whitish and with thinner cinereous pollen extending across the 
posterior two-fifths of each segment and also triangularly filling 
the extreme sides, first segment entirely cinereous pollinose, hairs 
very sparse, short and whitish; hypopygium of same diameter as 
abdomen, the lateral valves curved, two and one-half times as 
long as the width of the apical half, abruptly broader on basal 
half so as to form rectangular projection at middle beneath, apex 
of valves rounded, hairs rather sparse long and black, dorsal 
notch broad and deep, fringe of each side with black hairs; venter 
uniformly grayish dusted, its hairs fine, short, sparse and whitish. 
Legs entirely black, lightly dusted, the coxae cinereous, the hairs 
of femora and coxae white, of tibiae and tarsi black, bristles 
strong and black, pulvilli piceous. Wings hyaline, veins black, 
anterior crossvein a little before middle of discal cell. 
Female . — Hairs of face in large part black, the polished ovi- 
positor as long as sixth segment, blunt, ventral keel castaneous. 
Types . — Mount Rainier, Washington. Six specimens from 
Alta Vista, Crystal Mountain, and Van Trump Park, July and 
August, 1922 (Melander). 
The collection of these specimens was largely made possible 
through a grant from the Elizabeth Thompson Science Fund for 
a study of the alpine insect fauna of Mt. Rainier. 
Lasiopogon fumipennis, sp. nov. 
Female . — Length 8 mm. Black in ground-color, heavily 
dusted. Upper part of head brownish, hairs short, sparse, fine 
and black, face cinereous, pile long, abundant and black, pile of 
lower occiput fine dense and white; style one-third the length of 
the third joint of antenna. Mesonotum thickly brown-pollinose, 
dorsocentral vittse widely separated, moderately narrow and 
brown, median stripe not divided; humeri and pleurae cinereous, 
no pile, four black set« in hypopleural row, no dorsocentral 
bristles, two prealar black bristles, anterior part of notum with 
scattered minute appressed black setulae, no hairs; scutellum 
brownish gray pollinose, its sparse marginal hairs black. Post- 
erior two-fifths of abdominal segments cinereous pollinose, 
