64 COQUILLETT US ] 



vittae, abdomen elongate oval, fifth ventral segment destitute of spines 

 and of long bristles ; middle femora each bearing one long bristle on 

 the basal fifth of the anterior-under side and with short ones on the 

 remainder, with three long ones on the basal half of the posterior- 

 under side and with short ones on the apical half ; hind tibiae desti- 

 tute of bristles on the posterior side ; wings grayish hyaline, yellow in 

 the costal cell, the veins largely yellow, otherwise as in the male. 

 Length, 6 to 8 mm. Two pairs, taken in coition, July 10. 



Habitat. Popof Island, Alaska. 



Type. Cat. no. 5248, U. S. National Museum. 



Hylemyia simpla sp. nov. 



Black, the halteres yellow, lower part of front yellowish brown ; 

 frontal orbits contiguous for a short distance, antenna? nearly as long 

 as the face, the third joint only slightly longer than the second, longest 

 hairs of arista scarcely longer than greatest diameter of the arista ; 

 proboscis short and rather slender, labella large; mesonotum sub- 

 opaque, thinly dark grayish pruinose, the sides in front of wings light 

 gray pruinose, three pairs of postsutural dorsocentral bristles, sterno- 

 pleurals i + 2 ; abdomen depressed, nearly linear, dark gray pruinose, 

 the first segment and a median vitta, black, hairs of venter slightly in- 

 creasing in length toward its apex, hypopygium gray pruinose, destitute 

 of long bristles on its apical portion; front tibiae each bearing a bristle 

 near the middle of its inner-posterior side, the bristle at apex of inner 

 side sharp-pointed ; middle femora on the anterior-under side and 

 apical half of the posterior-under side ciliate with rather short bristles, 

 on the basal half of the posterior-under side with very long ones ; 

 middle tibiae each bearing one bristle on the inner-anterior side, one 

 on the outer-anterior, one on the outer-posterior, and two on the inner- 

 posterior side, all near the middle of the tibia ; hind femora sparsely 

 ciliate on the anterior-under side with rather long bristles, the poste- 

 rior-under side with very short ones and near the apex with two or 

 three rather long ones ; hind tibiae each bearing about six rather short 

 bristles on the anterior-inner side, five on the anterior-outer side, three 

 long ones on the outer side, the inner-posterior side ciliate with rather 

 short ones on the basal three- fourths ; wings hyaline, costal vein ciliate 

 with very short spines, costal spine much longer than the small cross- 

 vein, hind crossvein almost straight, calypteres yellowish ; length, 5 

 mm. A male specimen, collected June 16. 



Habitat. Sitka, Alaska. 



Type. Cat. no. 5249, U. S. National Museum. 



