56 COQUILLETT [44 2 ] 



prassutural intra-alar bristle longer than the adjacent supra-alar, ster- 

 nopleurals i -j- 2 ; abdomen yellowish gray pruinose and with darker, 

 olivaceous, reflecting spots; front tibiae destitute of bristles except at 

 the apices, middle femora ciliate with bristles on the basal two-thirds 

 of the under side, middle tibiae each bearing three bristles on the pos- 

 terior side of about their median third, hind femora ciliate the entire 

 length of their anterior-under side and with two bristles on the median 

 third, or penultimate fourth, of their posterior-under side, hind tibias 

 each bearing from two to four short bristles on the inner-anterior side, 

 two or three longer ones on the outer-anterior side, all on the median 

 third of the tibia, also one on the outer side near three-fourths 

 of the length of the tibia ; front pulvilli as long as the last tarsal joint ; 

 wings hyaline, tinged with yellowish brown at base and along the an- 

 terior half, hind crossvein strongly sinuous, small and hind crossveins 

 bordered with brown, third and fourth veins diverging, costal spine 

 shorter than the small crossvein, calypteres yellowish. 



Female: Same as the male with these exceptions: Middle femora 

 and sometimes the front ones and their tibiae, yellow ; hairs of eyes 

 rather sparse, front nearly twice as wide as either eye, destitute of a 

 pair of praeocellar bristles, a dark, changeable spot on upper part of 

 sides of face, front pulvilli much shorter than the last tarsal joint. 

 Length, 8 to 10 mm. Two males and three females. 



Habitat. Sitka, June 16; Kadiak, June 20; Yakutat, June 21; 

 Popof Island, Alaska, July 14. 



Type. Cat. no. 5243, U. S. National Museum. 



Hyetodesia lucorum (Fallen) . 



Musca lucorum FALLEN, Diptera Suec., Muscidoe, p. 55, 1820. 

 Aricia lucorum SCHINER, Fauna Austr., Diptera, i, p. 600, 1862. 



Kukak Bay, July 4; Popof Island, July 8 to 12; Kadiak, Alaska, 

 July 20: Ten specimens, of both sexes. A European species first re- 

 ported from this country by Mr. P. Stein about two years ago, recorded 

 as occurring in Massachusetts, Pennsylvania, Kansas, and Idaho. 



Hyetodesia brunneinervis (Stein). 



Aricia brunneinervis STEIN, Berliner Ent. Zeitsch., p. 183, 1898. 



Berg Bay, June 10; Sitka, June 16; Yakutat, June 21; Virgin 

 Bay, June 26; Kukak Bay, July 4; Popof Island, July 9 to 12; 

 Kadiak, July 20; Saldovia, Alaska, July 21 : Forty- seven specimens. 

 Originally described from Idaho. 



Hyetodesia septentrionalis (Stein). 



Aricia septentrionalis STEIN, Berliner Ent. Zeitsch., p. 184, 1898. 



