70 c Canadian Arctic Expedition, 1913-18 



slightly outward and forward, the others directed outward; orbital hairs 

 numerous and nearly as long aS the bristles; one to two long bristles situate^ 

 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 tlte 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 arciica, 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 vibrissse 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. Squamse 

 grey, margins brown. Halteres yellow, knobs brown. 



Narrowest part of frons as wide as distance across posterior ocelli, the orbits 

 lin,ear above and not over one sixth as wide as interfrontalia; profile as in PI. X, 

 fig. 33; hairs on eyes pale. Dorsum of thorax with 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; scutellum 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 tibiae 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 posteto-ventral; hind femora 

 with long bristly hairs from base to well beyond middle of postero-dorsal sur- 

 face; and much 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 



