Vol. XI] COLE— PRIBILOF ISLANDS DIPTERA 177 



pollinose, the metallic color when apparent more coppery than 

 mesonotum. Knob of halteres pale brown, the stem blackish. 



Abdomen metallic greenish, with coppery reflections, semi- 

 shining- but finely tessellate ; pile short and black. Femora metallic 

 greenish black, rest of legs black, all of pile black. Wings di- 

 stinctly infuscated, more strongly at base and along anterior 

 border, veins black, cross-veins not clouded ; R, +3 without ap- 

 pendiculate vein; M 2+3 not reaching margin of wing; R 4+r> 

 and M x parallel. (Fig. 4.) 



This species would run to cognata Loew. in Becker's table 

 of species and to breviceps or limpidipennis in the table given 

 by Jones (Univ. Cal., Tech. Bull., vol. I, p. 190). It differs 

 quite distinctly from these species in several important characters. 



Holotype, male, No 813, Mus. Calif, Acad. Sci. ; collected 

 by G. Dallas Hanna, June 28, 1920. 



Type locality, St. George Island, Alaska. 



