56 ' COQUILLETT [442] 



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

 nopleurals i + 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 tibiae 

 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 Suae, Muscidas, 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 bninneinervis (Stein). 



Aricia brunnemervis St'ei^, 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 2i : Forty-seven specimens. 

 Originally described from Idaho. 



Hyetodesia septentrionalis (Stein). 



Aricia septmtrionalis Stein, Berliner Ent. Zeitsch., p. 184, 1898. 



