66 COQUILLETT [45 2] 



the inner-anterior side, with five or six rather short bristles on the 

 median two-fourths of the outer-anterior side, with three bristles which 

 are successively longer, located at the first, second and third fifths of 

 the outer side, the inner-posterior side ciliate with rather short, down- 

 wardly curving bristles on nearly its entire length ; wings whitish 

 hyaline, costal vein not spined, costal spine minute, hind crossvein 

 slightly curved ; calypteres white. 



Female : Front at narrowest point slightly wider than either eye, 

 ocellar and frontal bristles stout, a pair of prreocellar bristles ; front 

 tibiae destitute of bristles except at the apices, middle tibiae each with 

 one bristle below middle of outer-anterior side and one near middle of 

 outer-posterior side ; hind tibia? each bearing about three bristles be- 

 low middle of the inner-anterior side, two on median third of the 

 outer-anterior side, and three on the outer-posterior side, otherwise 

 nearly as in the male. Length, 3 mm. A specimen of each sex, col- 

 lected June 10. 



Habitat. Berg Bay, Alaska. 



Type. Cat. no. 5250, U. S. National Museum. 



Hylephila silvestris (Fallen) . 



Musca silvestris FALLEN, Diptera Sueciae, Muscidas, p. 70, 1820. 

 Aricia silvestris ZETTERSTEDT, Dipt. Scand., iv, p. 1527, 1845. 

 Anthomyza murina ZETTERSTEDT, Insecta Lappon., p. 682, 1840. 

 Aricia decrepita ZETTERSTEDT, Dipt. Scand., iv, p. 1454, 1845. 



Kukak Bay, July 4; Popof Island, July 10; Kadiak, Alaska, July 

 20 : Thirteen specimens, of both sexes. A European species, now for 

 the first time reported from this Continent. The synonymy is accord- 

 ing to Mr. P. Stein, who made an examination of Zetterstedt's types. 

 This examination revealed the fact that in the cases of both murina 

 and decrepita, Zetterstedt had mistaken the females for males. 



Chirosia glauca sp. nov. 



Male : Black, the arista, except the basal fourth, and the halteres 

 yellow, front at narrowest point almost as wide as either eye, a pair 

 of small, cruciate praaocellar bristles ; antennae nearly as long as the 

 face, the third joint one and one-half times as long as the second, pro- 

 boscis short and rather robust, palpi each bearing about four rather 

 long bristles; body opaque, bluish gray pruinose, about four irregular 

 pairs of praesutural acrostichal bristles, sternopleurals four, the lower 

 two scarcely stouter than bristly hairs ; abdomen depressed, elongate- 

 ellipsoidal, hypopygium unusually large, nearly concealed beneath the 

 abdomen ; front tibia? destitute of bristles, front pulvilli about one-half 

 as long as the last tarsal joint, middle femora on under side sparsely 



