i 





MAR 2 B26 



Insecutor Inscitiae Menstruus 



Vol. VIII JANUARY-MARCH, 1920 Nos. 1-3 



THE MOSQUITOES OF BRITISH COLUMBIA AND 

 YUKON TERRITORY, CANADA 



(Diptera, Culicidce) 



By HARRISON G. DYAR 



During the summer of 1919 I continued the exploration of 

 the Canadian mosquito fauna westward from the Continental 

 Divide where I left it the previous season (Ins. Ins. Mens., 

 vii, 11-39, 1919) to the Pacific Ocean, and northward down 

 the Yukon Valley to near the Alaskan boundary. The streams 

 emptying into the Arctic Ocean were not explored in either 

 British Columbia or Yukon Territory, and some other omis- 

 sions are noted below. The season resulted in 11,230 speci- 

 mens, besides which I have 33 others, selected from the collec- 

 tion of Dr. C. Gordon Hewitt by his kind permission. 



A somewhat complicated condition exists in the west, owing 

 to the fact that two very distinct faunal regions are embraced 

 within the limits of British Columbia, while the Canadian 

 fauna proper divides up into several subregions in which pe- 

 culiar combinations of species occur. 



I. Canadian Fauna 



The Canadian fauna proper extends down the western slope 

 of the Rocky Mountains and reaches tide water at certain 

 points. It occupies all the mountains and smaller river val- 

 leys, but in the larger valleys is modified. The Kootenay- 

 Columbia region was explored in 1903 and, though the results 

 are unsatisfactory according to present standards, the region 

 evidently belongs to the border zone of the Canadian fauna 



