140 
Psyche 
[October 
pollinose, subshining, the short sparse hairs pale. Legs entirely 
black, the coxae pollinose and concolorous with pleurae, remainder 
of legs shining, very lightly dusted, the hairs and bristles black 
except the fine pile at base of femora beneath, pulvilli fuscous. 
Wings lightly infum.ated, veins black, anterior crossvein slightly 
before middle of discal cell. 
Female . — Pile of lower occiput more sordid white; lateral 
whitish hairs of abdomen shorter and confined to basal segment, 
ovipositor highly polished, short-conical, the ventral keel brown. 
Types . — Male and female, Moscow Mountains, Idaho, 
June 29, 1918 (Melander). Sixty paratypes from same locality 
(Melander) and from the Blue Mountains of southeastern 
Washington (Piper and Melander) and Nahcotta, Washington 
(Melander). The two specimens from Nahcotta, male and 
female are indistinguishable from the others, notwithstanding 
their totally different provenience. These specimens have been 
taken on almost every visit to Moscow Mountain. They occur 
along the trails and frequent rocks on the summit. It is a 
pleasure to dedicate this species in honor of Dr. J. M. Aldrich, 
and in memory of the many trips we have made together to this 
interesting collecting ground. The species is evidently very 
closely related to L. hivittatus Lw. but is constant in showing the 
bisected median stripe of the thorax. 
Lasiopogon delicatulus, sp. nov. 
Length 6 mm. Ground color entirely black, halteres 
yellow, the root of wing and the calypteres light brownish. 
Vertex dusted with dull yellowish-gray, face almost silvery, 
mystax and rather sparse facial hairs white, upper occiput 
brownish dusted, lower occiput becoming whitish, the lower 
hairs short silky and white, hairs and bristles of upper part of 
head short and black, style scarcely one-half the length of the 
broad third joint of antenna. Thorax brownish-pollinose, the 
dorsocentral stripes only vaguely indicated, middle stripe not 
divided, bristles black, scutellum completely dusted, bare except 
for the few marginal hairs; lower pleurae becoming grayish-blue, 
hypopleural fringe consisting of about five black setae. Abdomen 
