May, 1920] Descriptions of Diptera 287 



an<T;ulate at apex on upper side; face slightly concave in profile; cheek 

 about one-fifth as high as eye, with three strong and several weak bristles 

 in addition to the vibrissa; palpi long, somewhat paddle-shaped. Pre- 

 sutural acrostichals two-rowed; disc of scutellum with setulose hairs. 

 Fore femora stout, furnished with very short, dense, erect hairs on 

 ventral surfaces, and on postero ventral surface with rather irregular 

 long bristly hairs; fore tibia with three bristles, one anterodorsal, one 

 posterodorsal and one posterior, the ventral setulse dense and short ; mid 

 femora with numerous irregularly arranged weak black bristles on antero- 

 dorsal surface, and a few widely placed bristles on antero- and postero- 

 ventral surfaces; inid tibia with one antero- and one posterodorsal 

 bristl?, hind femur with armature similar to mid pair, except that the 

 antero ventral bristles are stronger, more numerous and more closely 

 placed; hind tibia with one anterodorsal and two posterodorsal bristles. 

 Wing- veins thick; inner cross-vein just beyond apex of first vein and 

 middle of discal ceil; third and foiirth veins very distinctly divergent at 

 .apices. 



Length, 6 mm. 



Type locality, Katmai, Alaska, July, 1917 (J. S. Hine). 



