1923] 
The Genus Lasiopogon 
143 
strong tooth, hairs coarse and black, venter concolorous with 
posterior portions of tergites, its hairs fine and whitish. Hairs 
of femora white in large part, the outer half of femora with about 
five extensor setae, the upper front face of hind femora setose; 
tarsi concolorous with remainder of legs, claws piceous with 
black apex, pulvilli alutaceous. Halteres and calypteres yellowish; 
wings lightly cinereous, veins black, anterior crossvein slightly 
before middle of discal cell. 
Female . — Ovipositor short, ventral keel black, hairs of 
abdomen short and mostly black. 
Types . — Mount Adams, Washington, July 24, 1921 (Melan- 
der). Other localities, Moscow Mountain, Idaho, and Mount 
Rainier, Washington. Thirty specimens. 
Lasiopogon ripicola, sp. nov. 
Male . — Length 10 mm. Dull brownish-gray, heavily 
pollinose and rather densely pilose species, upper part of head 
alutaceous, with abundance of black hairs but no bristles, face 
whitish, the dense hairs nearly white with slightly yellowish 
tinge, with a few black hairs intermixed on upper portion, lower 
occiput heavily white pilose, antennal hairs black, third joint 
compressed cylindrical, slightly more than twice the length of 
the acuminate style. Dorsum of thorax brownish-gray, the 
dorsocentral vitta^ widely separated, dark l)rown and rather 
narrow, bearing about six very fine black seta3 of which three are 
presutural, humeri cinereous, lateral markings very indistinct, 
three prealar bristles; scutellum dark cinereous, the apical fine 
bristles black and hairs white; pleurae cinereous with faint 
yellow tinge, mesopleura with black hairs behind, sternopleura 
with fine white hairs, hypopleural fringe consisting of a few white 
and black bristle-like hairs. Abdomen not shining, the segments 
dark brown with apical two-fifths cinereous, the brown color 
intensified as two semicircular spots, the gray color extending 
forward triangularly between the brown markings, pile cons- 
picuous and whitish, long on sides of second and third segments, 
sides of first segment with a cluster of black bristles in addition 
to the pile ; hypopygium larger than diameter of end of abdomen, 
