Vol. XI] MALLOCH— PRIBILOF ISLANDS DIPTERA 179 



There are three species which I assign to this genus which 

 may be separated as indicated below. 



Genotype, Eupogonomyia pribilofensis Malloch, new species. 



Key to Males 



a. Mid-femur with anteroventral surface bare except apically 



where there are a few setulose hairs ; anterior surface at 

 base with about four curved bristles. borealis Malloch. 



aa. Anteroventral surface of mid-femur with some long slender 

 bristles proximad or distad of middle b. 



b. Mid-femur with some long fine curled bristles about one- 



fourth from apex on anteroventral surface, the posteroven- 

 tral surface with a series of long hairs on entire length. 



grcenlandica Lundbeck. 



bb. Mid-femur densely clothed on basal half of anteroventral and 

 ventral surfaces with long bristly hairs, the posteroventral 

 surface with bristly hairs except at base. 



pribilofensis, new species. 



3. Eupogonomyia pribilofensis Malloch, new species 



Male: Length 7 mm. Black, shining, thorax and abdomen 

 with gray pruinescence. Abdomen with a black dorsocentral 

 vitta which is dilated subtriangularly at the apex of each tergite. 

 Wings hyaline, veins black to bases. Knobs of halteres black. 



Eyes bare, separated at narrowest part of frons by a distance 

 a little greater than width across posterior ocelli ; orbits with fine 

 hairs on entire length ; parafacial at base of antennae wider than 

 third antennal segment and height of cheek, not narrowed below, 

 the vibrissal angle produced much beyond a vertical line drawn 

 from base of antennae. Antennae separated at base, third segment 

 not longer than second ; arista subnude, swollen on basal half ; 

 proboscis slender, not much elongated. Thorax with 4 pairs of 

 postsutural dorsocentrals. Abdomen subcylindrical, with numer- 

 ous long, slender bristles, those on fourth tergite apically and 

 laterally rather conspicuous ; sixth tergite distinct, with numerous 

 setulose hairs; fifth sternite with a shallow rounded posterior 

 emargination, and numerous fine lateral bristles at apex. Fore 

 tibia with two or three median postero-ventral bristles; fore 

 tarsus not longer than tibia, fourth segment with two short 

 bristles at apex; mid-femur with dense bristly hairs on basal 

 two-thirds of anteroventral and ventral surfaces, the postero- 

 ventral surface with some fine bristles except apically; mid-tibia 



