1923 ] 
The Genus Cyrtopogon 
119 
delicate and white; antennae black, basal joints equal, hairs few 
and black, third joint slightly longer than basal joints together, 
style acuminate, one-eigth the length of the third joint. Pronotum 
shining black, a median inverted trianglar mark and a subhumeral 
spot of golden pollen, sides with tuft of white pile; mesonotum 
tomentose except postalar callosities and adjacent area, median 
geminate stripe light brown, interrupted a short distance 
behind suture, the usual broad lateral stripe consisting of a 
vaguely rounded mark on each side of suture, humeri 
golden, front part of mesonotum golden-gray, rear middle part 
cinereous; notal hairs short, sparse and black, lateral bristles 
black; scutellum convex, shining black, a touch of yellow pollen 
at base, no discal hairs, marginal hairs sparse and black; pleurse 
lightly cinereous, more golden above, pteropleura shining, tri- 
chostichal hairs white. Abdomen slender, shining, sides of first 
segment with tufted white pile, of second segment with looser 
white hairs, third and fourth segment with short fulvous hairs: 
fifth, sixth and seventh segments and hypopygium with black 
hairs, posterior margins of second to fifth segments laterally 
golden tomentose, hypopygium globose, wider than termination 
of abdomen; venter black, hairs yellow. Femora black, tibiae 
and tarsi reddish except apex, hairs largely whitish, bristles 
black, two strong yellow bristles near middle of anterior face of 
hind femora, inner face of front and hind tibiae with close deep 
golden pubescence, claws black with brown base. Halteres and 
calypteres yellow, wings broad and hyaline, veins piceous, yel- 
lowish at base, a very faint cloud over crossveins, anterior cross- 
vein at one-fifth length of discal cell, anal cell briefly open. 
Holotype. — Coniston, Ontario, 27, July (H. S. Parish). 
