80 c Canadian Arctic Expedition, 1913-18 



bristle on dorsal surface near apex. Inner cross-vein distinctly beyond apex of 

 first vein and at three-sevenths from apex of discal cell; penultimate section of 

 fourth vein about half as lofig as ultimate section. 



Length, 4-5 mm. 



Type Locality: Collinson point, Alaska, June 20, 1914 (F. Johansen). 



Allomyia, n. gen. 



I described this genus in a paper, which was completed some time ago, on 

 Pribilof Island Diptera, but it will not go to press until after this paper. I had in 

 that collection the female only. The generic synopsis in this paper and the 

 following description may be accepted as embodying characters of the genus, 

 though it is possible that the furcate processes of the fifth abdominal sternite are 

 not present in the male of the other species. 



Allomyia unguiculata, n. sp. 



MALE. Black, thorax and abdomen greyish pruinose. Head brownish, 

 black, anterior portion of frons, lower half of face, and anterior part of cheeks 

 yellowish; antennae black; palpi yellow; proboscis black. Legs black, tibiae 

 brownish, yellow at bases, tarsi brown. Wings clear. 



Orbital bristles rather weak; antennae large, third joint about twice as long 

 as second, subangulate at apex on upper side (PL X, fig. 37) ; arista bare, tapered 

 on basal third of apical joint; cheek about one- fourth the eye-height. Dorsum 

 of thorax with five well-developed dorso-centrals; scutellum with short discal 

 hairs and four strong marginal bristles; pteropleura with hairs on centre; sterno- 

 pleura with long hairs and one strong bristle. Abdomen subcylindrical, narrow, 

 fifth sternite with a large bifid plate on each side (PL X, fig. 38), hypopygium 

 small (PL X, fig. 36). Legs as in Dasypleurvn, but the fore tibia? with short 

 ventral spines; tibiae with the bristles as follows fore tibia with one antero- 

 dorsal and one to two posterior, mid tibia with one antero-dorsal, one postero- 

 dorsal, and one posterior, hind tibia with two antero-ventral near apex, two 

 antero-dorsal, and one postero-dorsal. Inner cross-vein well beyond apex of 

 first and at less than two-fifths from apex of discal cell. 



Length, 3-5 mm. 



Type locality: Chantry island, Bernard harbour, Dolphin and Union 

 strait, Northwest Territories, June 17, 1916 (F. Johansen). 



This specimen was in very poor condition, and in order to get the structures 

 into condition for examination I had to boil it. Originally pinned, it is now 

 preserved in alcohol, in a fragmentary condition. 



The foregoing species differs from the genotype in the colour of head and 

 legs, in having the palpi narrower, and the wings longer and with thinner veins. 



Ernoneura Becker. 



This genus has only once previously been recorded from the western hemis- 

 phere. There is only one species of the genus, which was originally described 

 by Zetterstedt frowi the European arctics. 



Ernoneura argus Zetterstedt. 



Represented by five specimens taken at Bernard harbour, Dolphin and 

 Union strait, Northwest Territories, three specimens, .July 19, 1915, and two 

 specimens, July, 1916. 



Becker states th:it there is no sternopleural bristle present, but it is well 

 developed in the specimens before me. 



