80 
Psyche 
[April 
brownish, arista blackish. Pectus and the part of the pleurse 
above front coxse brownish yellow, sometimes humeri brown, 
notal hairs minute and sparse, two strong sternopleurals. Base 
of abdomen subshining at sides, remainder of abdomen polished, 
genitalia small and retracted. Front coxse whitish, basal half 
of front femora yellow, apical half black, ten flexor setae, base 
of front tibiae yellowish, remainder black, front metatarsi black, 
other joints yellowish, posterior legs yellowish, the hind femora 
distally slightly brown. Halteres, calypteres and fringe and root 
of wings whitish; wings rather pointed, veins brown, first post- 
erior cell two-thirds as wide as submarginal on the costa, anterior 
crossvein at three-fifths the length of the discal cell and one-third 
as long as posterior crossvein. 
Female. Front tarsi wholly black, the metatarsus somewhat 
thicker than the other joints; ovipositor terete. 
Types. Lookout Mt., Priest Lake, Idaho, 20 August, 1919, 
paratypes. Lake McDonald, Glacier Park, Montana; Moscow 
Mt., Idaho; and Mt. Spokane, Washington; July-September: 
fifteen males and six females. 
Mycetaulus polypori, n. sp. 
Male. Length 3.5 mm. Head and thorax testaceous, 
abdomen blackish, legs mostly testaceous yellow, the distal part 
of front femora and tibiae and the front tarsi blackish, wings 
narrowly blackened at apex. Antennae pale yellow, arista brown, 
occipital black setulae conspicuous; front wider than long and 
two-thirds as wide at lunule as at ocelli. Thoracic hairs fine 
and rather abundant, bristles long, two dorsocentrals. Base 
and apex of abdomen and venter yellowish brown, genitalia 
small, with spiral yellow filament. Front coxse yellow, sometimes 
the front femora lack the darkening at the apex. Halteres 
white, calypteres yellowish white, the fringe brown; wings 
yellowish hyaline, auxiliary and first vein, distal end of second, 
third and fourth veins and apical part of costa blackish, re- 
mainder of veins yellowish, a narrow blackish cloud following 
