The Mosquitoes collected by the Canadian Arctic Expedition, 



1913-18. 



(Diptera, Culicidae.) 

 By HARRISON G. DYAR. 



INTRODUCTION. 



Many stories are current about the extraordinary abundance of mosquitoes 

 in the Arctic regions, rivalling the tropics in this respect. That these stoi it- 

 are not overdrawn, is shown by the accompanying photographs, taken in the 

 deltas of the Colville and Slave rivers by Dr. R. M. Anderson of the Canadian 

 Arctic Expedition. Nevertheless, the number of species present is small in the 

 northern regions, though individuals may be abundant. Along the Arctic coast 

 of the Northwest Territories, here considered, but two species are identified, 

 whereas a collection of an equal number of specimens in the tropics might 

 include thirty or forty species. 



Head net, as used in the North for pro- 

 tection against mosquitoes. Delta 

 of Slave River, Great Slave lake, 

 N.W.T., June, 1908. 



Mosquitoes on back of man's hooded coat. 



Near Nigalik, delta of Colville river. 



Arctic coast of Alaska. July 3, 



1909. 



The collection before me was made during the years 1913, 1914, 1915, and 

 1916; but it is disappointingly a small one (134 specimens), and the material is 

 in very poor condition. The region, however > is interesting, embracing the 

 Arctic coast of Alaska and the Canadian Northwest Territories. 



