1915.] NATURAL SCIENCES OF PHILADELPHIA. 497 
narrowly .split by a pale middle vitta, lateral stripes quite indistinct; 
scutum yellowish brown with the lol)es darker, grayish; scutellum 
yellowish brown; postnotum light gray. Pleura clear light gray, 
with the membranaceous area yellowish. Haiteres rather short, 
brown, the knobs dark brown with the apex more yellowish. Legs 
with the coxae brown with a sparse grayish bloom;- trochanters dull 
yellow; femora brownish yellow, narrowly tipped with dark brown; 
tibiae and tarsi brown. Wings light grayish l)rown, the costal region 
scarcely darker, the wing-apex darkened; stigma dark brown; a 
broad vitreous antestigmal band and a large vitreous spot beyond 
the stigma in the apex of cell second Ri and base of cell R->. 
Abdominal tergites one and two yellowish, the remaining tergites 
dark l^rown with a narrow dark brown median vitta; a narrow 
caudal margin of yellowish silver; sternites yellow with a broad 
median triangle on segments five to seven with the apex of the 
triangle at the caudal margin; segments eight and nine brownish 
yellow; hypopygium enlarged. Male hypopygium with the ninth 
tergite large, prominent, the dorsal surface flat or a little convex; 
the caudal margin with a very deep V-shaped notch, the lateral 
lobes a little produced on the outer side. Ninth sterno-pleurite 
somewhat restricted, the pleural suture not well indicated, the 
pleurite lying on the dorso-caudal face of the sternite; outer pleural 
appendage a very slender filiform lol)e, fleshy, pale, with long hairs; 
inner pleural appendage complex, the caudal lobe produced into a 
slender curved hook which is bent upward; the inner lobe is flattened? 
the anterior margin blackened and heavily chitinized, deeply notched ; 
the blade with a protecting mantle of delicate fine ribules (as in 
monticola). Ninth sternite darker colored than the pleurite and 
provided with a few scattered hairs, deeply notched medialh'; a 
stout pendulous lobe which bears a dense tuft or pencil of long 
reddish hairs, this pencil directed ventrad. Eighth sternite large, 
prominent, extending far caudad and its concavity forming a sheath 
for the base of the ninth sternite; the lateral angles bear dense 
tufts of long, stout, reddish-silvery hairs which are decussate; be- 
tween these lobes a broad median projection whose lateral angles 
are slightly recurved and whose caudal margin is broadly concave; 
this latter lobe is hidden by the prominent tufts of hair. 
Habitat. — Arctic America. 
Holotype, cf , Hudsons Bay Territory, Canada (Kennicott). 
The type is in the collection of the Museum of Comparative 
Zoology, where the specimen bore in Loew's writing the name adopted 
.herein.' 
