280 The Ohio Journal of Science [Vol. XX, No. 7, 



Hylemyia atrovittata sp. n. 



Male. Black, slightly shining, \vith grayish pruinescence. Head 

 black, orbits, face, parafacials and cheeks with white pruinescence; 

 interfrontalia anteriorly and upper anterior part of parafacials some- 

 times brownish red. Thoracic dorsum with five very conspicuous 

 black vittce, the interspaces drab gray pruinescent. Abdomen with a 

 very broad black dorsocentral vitta which is slightly interrupted at 

 posterior margin and connected with a narrow black fascia at anterior 

 margin of each tergite; hypopygium glossy black, slightly gray pruines- 

 cent. Legs black. Wings slightly grayish. Calyptrse white. Halteres 

 yellow. 



Narrowest part of frons as wide as distance between posterior 

 ocelli; interfrontalia not obliterated, with a pair of bristles above middle; 

 orbits with long fine bristles to middle; parafacial at base of antenna a 

 little wider than third antennal segment, not narrowed below; cheek 

 higher than width of parafacial, with long fine bristles on lower margin, 

 some of which, anteriorly, are upwardly curved; arista pubescent, much 

 swollen on basal fifth; third antennal segment nearly twice as long as 

 second. Presutural acrostichals long, two-rowed; many long hairs 

 laterad of posthumerals ; prealar not one-third as long as the bristle 

 behind it; stemopleurals 1 : 2 or 1:3. Abdomen narrow, depressed; 

 hypopygium of moderate size; fifth stemite with processes broad, 

 furnished at base of each with a fringe of downwardly directed setulose 

 hairs and on apical half with many similar hairs. Fore tibia with a 

 median posterior bristle; mid femur with a series of bristles on postero- 

 ventral surface, their length decreasing to apex; mid tibia with two 

 posterodorsal, and two or three posterior bristles; hind femur with a 

 series of bristles on entire length of anteroventral surface and another on 

 post ero ventral, the latter almost ceasing before apex; hind tibia with 

 two or three anteroventral, four or five anterodorsal and three or four 

 posterodorsal bristles, and four or five posterior setulas. Costal thorn 

 very sinall. 



Length, 4 mm. 



Type, and 12 paratypes, Katmai, Alaska, June and July, 

 1917. 



Hylemyia sericea sp. n. 



Male. Black, slightly shining, densely brownish gray pruinescent. 

 Head black, sometimes with the anterior part of interfrontalia and 

 parafacials reddish; orbits, face and cheeks with yellowish pruinescence; 

 antennse and palpi black. Thorax indistinctly vittate. Abdomen with 

 a slight silky luster, the black dorsocentral vitta linear. Legs black. 

 "Wings slightly brownish, veins dark brown, yellow at bases. Calyptrse 

 and halteres yellow. 



Narrowest part of frons as wide as anterior ocellus; orbits setulose 

 to middle, and with a pair of very small hairs near anterior ocellus; 

 interfrontalia almost obliterated above, with a pair of fine bristles at 



