May, 1920] Descriptions of Diptera 283 



some long bristles on basal half of anteroventral surface; mid tibia 

 with an anterodorsal, two posterodorsal, and two posterior bristles, 

 and sometimes an anterior setula; hind femur with long bristles on 

 anteroventral surface, and one or two on basal half of posteroventral ; 

 hind tibia with two or three anteroventral, five or six anterodorsal, and 

 three or four posterodorsal bristles, and some setulse on posterior surface 

 near middle. 



Length, 5.5 mm. 



Type and three paratypes, Katmai, Alaska, June 10, 1919. 



Hylemyia parvicomis sp, n. 



Male. Similar in color to substriata. The anterior part of inter- 

 frontalia and part of parafacial reddish. Thorax rather indistinctly 

 vittate. Abdominal dorsocentral vitta slightly dilated at anterior 

 margin of each tergite. 



Narrowest part of frons about as wide as anterior ocellus; inter- 

 frontalia distinct throughout, with a pair of long fine bristles above 

 middle; orbits with setulose hairs to near middle; parafacial at base of 

 antenna about as wide as third antennal segment, narrowed below; 

 third antennal segment not twice as long as wide; arista pubescent, 

 swollen at base. Three or four pairs of moderately strong presutural 

 acrostichals present, one pair much longer than the others; prealar 

 one-third as long as the bristle behind it. Fifth sternite as in Figure 11 ; 

 hypopygium as in Figures 20 and 43. Fore tibia with a median posterior 

 bristle ; mid femur with some long bristle on basal half of anteroventral 

 surface; mid tibia with one or two posterodorsal and posterior bristles; 

 hind femur with the anteroventral bristles much longer on the apical 

 than on the basal half, the posteroventral surface with short fine bristles 

 on entire length; hind tibia with two or three anteroventral, four antero- 

 dorsal, and three posterodorsal bristles, the posterior surface with some 

 setulas at middle. Last section of fourth vein less than twice as long 

 as preceding section. 



Length, 4 mm. 



Type, Kodiak, Alaska, June, 1917. Paratypes, four males, 

 same locality, June, 1917. 



Hylemyia subnitida sp. n. 



Male. Differs from parvicomis in having the thorax less distinctly 

 vittate, the abdomen with the dorsocentral vitta distinctly interrupted 

 at apex of each tergite, and the parafacials black. 



Parafacial narrower than in parvicomis, and the cheeks not so high, 

 fifth sternite with very fine hairs along the inner margin of each process, 

 though not fringed, mid tibia with a strong anterodorsal bristle, antero- 

 ventral bristles on hind femur longer and sparser, and those on postero- 

 ventral surface longer and not forming a complete series. 



Length, 4 mm. 



Type, Kodiak, Alaska, July, 1917. One male. 



