Vol. XI] COLE— PRIBILOF ISLANDS DIPTERA 169 



DIPTERA FROM THE PRIBILOF ISLANDS, ALASKA 



BY 

 F. R. COLE 



Stanford University 



A few Diptera have been recorded from the Pribilof Islands 

 in past years, but heretofore no extensive collection has formed 

 the basis of a report. Dr. G. Dallas Hanna and Mr. A. G. Whit- 

 ney made a collection a few years ago and reports were pre- 

 pared by Mr. J. R. Malloch and Dr. C. P. Alexander on the 

 Diptera in general and the Tipulidae, respectively. The fol- 

 lowing list is based solely upon the considerable series secured 

 by Dr. Hanna in 1920. The Tipulidae were determined by 

 Dr. C. P. Alexander; the Anthomyiidae, Chironomidae and 

 some of the Scatophagidae by Mr. J. R. Malloch ; and one 

 species of Dolichopodidae by Mr. M. C. Van Duzee. Their 

 reports appear as sections of the present series. 



Owing to the cold, foggy, summer climate of the Pribilof 

 Islands, one would not expect to find many species of flies, 

 especially as the islands are about 200 miles from the main- 

 land ; but there is a considerable number and some of them 

 are said to occur in almost incredible abundance. The large 

 number of decomposing carcasses of fur-seals and the kelp 

 beds along the beaches attract many scavengers, such as cer- 

 tain of the Muscidae, Scatophagidae and Anthomyiidae. This 

 dampness of the climate also makes the preservation of dry 

 specimens somewhat difficult. 



CHIRONOMIDJE 



The few species collected were examined by Mr. Malloch. 

 All of the specimens were in rather poor condition for study. 



mycetophilid;e 



1. Boletina obesula Johanns. 



One female, St. Paul Island, June 21. The type is a female, 

 taken at the head of the Tsirku River, Alaska. 



