22 INSECUTOR INSCITL^ MENSTRUUS 



in the center of the town where the reservoir stands. The 

 view shows a number of muskeg-pools in the foreground, sit- 

 uated on the steep hillside, which is much steeper than appears, 

 due to the camera having been pointed downward in taking 

 the view. 



These conditions have produced an entire change in the 

 species of A'edes for the region. The whole Canadian fauna 

 is completely cut off, not a species surviving, while three en- 

 demic species take its place. These three species are all de- 

 rivatives of punctor, which we have found to be the most hardy 

 member of the Canadian fauna, but they are specifically dis- 

 tinct therefrom, though closely allied among themselves. The 

 Culiseta, inhabiting permanent pools in the bottom lands, find 

 conditions here similar to those elsewhere, and the species have 

 not changed. 



The Coastal Region extends northward as far as the island 

 barrier. North of Cape Spencer I do not yet know what 

 conditions obtain. The region extends southward, west of the 

 Coast Range, to the United States, being cut narrowly by the 

 Skeena River and more broadly by the Fraser. It embraces 

 all of Vancouver Island. In western Washington and Oregon 

 it broadens out, embracing the region between the Cascades 

 and the sea. The rainfall is less continuous here, but the same 

 general characters persist. Its exact southern limits are un- 

 known to me, owing to lack of collections. The upper valleys 

 of the Olympic Mountains are unexplored, as are most of the 

 isolated peaks from Mount Baker to Mount Shasta. In the 

 mountain meadows of the Mount Rainier region no species of 

 this group occurred. We found altiusculus (a derivative of the 

 Calif ornian tahoensis), although aboriginis, the dominant 

 Coastal species, occurred in the foothills. 



East of the Cascades arid conditions immediately supervene, 

 with the appropriate fauna ; so it is this Coastal Region which 

 widely intervenes between the Canadian Fauna and that of the 

 Californian mountains, and permits the existence of a separate 

 fauna there. A comparative list of the Canadian and Cali- 

 fornian species may be of interest. Some of the species may 



