68 c Canadian Arctic Expedition, 1913-18 



Pogonomyia quadridetosa; antennae short, third joint less than twice as long 

 as second; arista bare, second joint as long as thick, third swollen for about 

 one-third of its length; cheek about one-fourth as high as eye, densely haired 

 on lower half, the bristly hairs almost uniform in length and strength, vibrissas 

 well differentiated; palpi slender, nearly as long as apical portion of proboscis. 

 Dorsum of thorax not very conspicuously hairy; presutural acrostichals weak, 

 irregularly four-rowed; postsutural dorso-centrals four, prealar bristle very 

 small; a group of numerous bristly hairs above fore coxse; sternopleura with 

 very long hairs and two strong bristles, one in front and the other behind . 

 Abdomen with short bristly hairs and no long bristles. Legs similar to those of 

 Pogonomyia in form; fore coxae without stout bristles; fore tibia with two to 

 three weak posterior bristles, apical spines short ventrally; mid femora with a 

 few weak bristles on basal half of antero-ventral surface; mid tibia with two 

 to three antero-ventral, two to four antero-dorsal, four to six postero-dorsal, 

 and two to three postero-ventral bristles on surface; hind femora with rather 

 weak bristles on greater portion of antero-ventral surface; hind tibia with 

 three to four antero-ventral, three to five antero-dorsal, and six to eight postero- 

 dorsal bristles, none of which are very long; mid and hind tarsi with short, 

 rather closely placed bristles. Costal thorn indistinct;, outer cross-vein straight ; 

 last section of fourth vein about 1*75 as long as preceding section. 



Length, 7 mm. 



Type locality: Bernard harbour, Dolphin and Union strait, Northwest 

 Territories, July 7, 1915 (F. Johansen). 



I have seen a series of specimens of this species from the arctic region in 

 another collection, and find that the pteropleural hairs are rarely absent. The 

 characterization here given holds good throughout the series. 



coenosiin^:. 



There are two imagines of this sub-family in the collection. Both belong- 

 to the genus Coenosia and represent different species, but only one is in good 

 enough condition to permit of its identification. 



Coenosia octomaculata Zetterstedt. 



Coenosia octomaculata Zetterstedt. Ins. Lapp., p. 141, 1840. 



This northern European species has not hitherto been recorded from this 

 continent. Although very closely resembling geniculata Fallen, it is very 

 readily separated from it by the much smaller lower squama, which barely 

 projects beyond the upper. In the specimen before me the mid tibiae have the 

 antero-dorsal and postero-dorsal bristles at the same height, whereas in my 

 specimens of geniculata from Illinois the antero-dorsal one is much nearer apex 

 of tibia. 



Locality: Nome, Alaska, August 24 and 25, 1916 (F. Johansen). 



Coenosia, sp. 



One female in very poor condition. The legs appear to be black or fuscous, 

 with only the bases of the tibiae pale. 



Locality: Bernard harbour, Dolphin and Union strait, Northwest Terri- 

 tories, July 10, 1915 (F. Johansen). 



ANTHOMYIIN^. 



There is one genus in this collection which has been previously known from 

 arctic Europe only, and another has been listed as belonging to Anthomyia. In 



