70 c Canadian Arctic Expedition, 1913-18 
sligbtly outward and forward, the others directed outward; orbital hairs 
numerous and nearly as long as the bristles; one to two long bristles situated 
above vibrissa. Abdomen tapered at apex; last segment not exposed, making 
it impossible to say if it is armed with curved thorns. Legs and wings as in male. 
Length, 6 mm. 
Type locality: Cockburn point. Dolphin and Union strait. Northwest 
Territories, September 5, 1914 (F. Johansen). Allotype, Bernard harbour, 
Northwest Territories, June 1915, (F. Johansen). 
This species agrees with divisa Meigen in having the hypopleura with hairs 
on upper portion, but differs from it and all other species known to me in having 
the orbit in the female armed with long hairs in addition to the bristles, and in the 
very conspicuously bristly hypopygium and long costal thorn. 
A female specimen, in very poor condition, from Collinson point, Alaska, 
June 22-23, 1914, may represent a distinct species. The mid tibia on one side is 
gone, but the one remaining is reddish and less bristly than in arctica, but without 
better preserved examples it is impossible to say definitely as to its specific 
identity. 
AUiopsis Schnabl and Dziedzicki. 
Generic Characters. 
Male. — Very robust. Head large, eyes long-haired, narrowly separated 
above; antennae shorter than face; arista almost bare; cheeks with very 
numerous long bristles on lower margin and anteriorly, the vibrissa not 
differentiated. Thorax with three pairs of postsutural dorsocentrals; 
calyptrse of moderate size, lower scale not projecting. Abdomen broad ovate, 
its length barely exceeding its greatest width; hypopygium small; apical 
visible ventral segment with a wedge-shaped central incision. Legs stout, 
strongly bristled. Sixth vein extending to margin of wing. 
Female. — Head as in male but the eyes are more widely separated; orbital 
bristles numerous, hair-like, erect and slightly inwardly directed, outer supra- 
orbitals and cruciate interfrontal bristles absent. In other respects similar 
to male, the abdomen not so broad and more pointed apically. 
AUiopsis obesa, n. sp. 
Male. — -Black, shining. Wings slightly greyish, fuscous at base. Squamne 
grey, margins brown. Halteres yellow, knobs brown. 
Narrowest part of frons as wide as distance across posterior ocelli, the orbits 
linear above and not over one sixth as wide as interfrontalia; profile as in PI. X, 
fig. 33; hairs on eyes pale. Dorsum of thorax wath long hairs; acrostichals 
long and hair-like, irregularly four rowed cephalad of suture; posthumeral and 
presutural bristles strong, the latter duplicated on both sides, and the former on 
one side, in type; prescutellar bristles weak; scutcUum with four long marginal 
bristles, numerous long discal hairs, and very distinct ventral pile; propleura 
above coxae with a conspicuous clump of long bristly hairs; sternopleurals three 
in number; hypopleura bare. Abdomen with long setulose hairs on entire 
surface, those at apices of segments bristle-like; fourth segment the shortest; 
hypopygium very small, globose, glossy. Legs rather densely covered with 
moderately long setulose hairs; bristles on fore and mid tibise hardly distinguish- 
able from the hairs but apparently as follows: fore tibiae with two to three on 
postero-dorsal surface; mid tibiae with two to three on each of the following 
surfaces — antero-dorsal, postero-dorsal, and postero-ventral; hind femora 
with long bristly haii'S from base to well beyond middle of postero-dorsal sur- 
face, and nuich stronger bristles on the whole length of antero-ventral surface; 
hind tibiae with four to five short bristles on apical half of antero-ventral surface, 
six to eight longer bristles on entire length of antero-dorsal surface, and six to 
seven long slender bristles on postero-dorsal surface, the so-called preapical bristle 
very long, and very slender at apex; tarsi normal. Wings greatly exceeding 
