Vol. XI] COLE— PRIBILOF ISLANDS DIPTERA 171 



scutellum black, the rest translucent yellow, rather densely yellow 

 pilose. Pleura semishining black, with black pile. Halteres small 

 and yellowish, the stigmata below halteres with short, dense, fur- 

 like, bright yellow pile. 



First abdominal segment semishining black, second with broad 

 yellow lateral margin, the yellow portion triangular in shape and 

 reaching one-third distance across abdomen ; third segment with 

 small round yellow spot on anterior corners ; remainder of abdo- 

 men black, the posterior portion of 2 to 5 shining, the basal por- 

 tion opaque ; a pair of linear, oblique, yellow pollinose marks 

 on dorsum of third and fourth segments. Pile of abdomen largely 

 yellow, black on posterior margins of third, fourth and fifth 

 segments. Venter semishining black, with sparse whitish yellow 

 pile. Legs black, extreme tips of femora and bases of tibiae ; 

 pile of front femora and most of pile of middle and hind femora, 

 black ; some yellowish pile ; hind tibia arcuate ; hind femora 

 noticeably thickened and with black bristles below, short and 

 dense on outer third; short pile below on tarsi golden yellow. 

 Wings hyaline and about as figured for P. perfidiosus; anterior 

 cross-vein slightly beyond middle of cell 1st A. 



Male: Length 11.5 mm. Very near the female in appearance. 

 Eyes widely separated, frons almost twice as wide as . ocellar 

 tubercle; vertex noticeably convex, a depression between it and 

 antennal protuberance. Abdomen lacks oblique yellowish polli- 

 nose marks on third and fourth segments. Hypopygium quite 

 large, blackish, with short yellow pile. 



Holotype, female, No. 808, and allotype, male, No. 809, Mus. 

 Calif. Acad Sci. ; collected by G. Dallas Hanna, August 20, 1920. 



Type locality, St. Paul Island, Alaska. 



9. Syrphus contumax O. S. 

 St. George Island, June 30. This species has a wide northern 

 range. 



TACHINID^E 

 10. Didyma pullata v. d. Wulp. 



St. Paul Island, July 21 and August 10. The type was 

 described from the high mountains in Guerrero, Mexico. Co- 

 quillett determined a specimen from Farragut Bay, Alaska, as 

 this species. 



