1916] Dice: Land Vertebrates of Southeastern Washington 321 



WATER-MARGIN HABITAT AND ASSOCIATION 



(BLUE MOUNTAIN AREA) 

 Exclusive: 



Rana pretiosa. Neosorex uavigator navigator. 



Major : 



Thamnophis elegans. Castor oanadensis canadensis. 



Mierotus mordax mordax. 



Minor: 



Cinclus mexioana uuieolor — ■ Evotomys gapperi saturatus. 



Eeported: 



Telmatodytes palnstris plesius — summer. 



Along the streams of the Bhie Mountain gravel or imul bars are 

 rare and the forest often reaches the edge of the stream and partially 

 overhangs the water. Springs are quite numerous in the bottoms of 

 the canons and these often produce moist areas which make little 

 swamps. Such swamps are often shaded by the heavy lowland fir 

 trees and have only a low growth of vegetation, but in more open spots 

 grasses and horsetails as well as smaller herbs make a luxuriant growth. 

 Swamps also occur along small sloughs diverted from the main streams 

 or about ponds caused by the damming of some stream by a beaver dam 

 or by the natural accumulation of drift. 



AQUATIC HABITAT AND ASSOCIATION (BLUE MOUNTAIN AREA) 



Major : 



Streptoeeryle alcyon c-aurina — Cim-lus mexieauus uuioolor — 



summer. summer. 



Minor : 



Castor canadensis canadensis. 



The streams in the Blue Mountains are all small and have swift 

 currents. There are many rapids and low falls and the pools are 

 small. There is very little extent of open water free from the margins 

 of the streams. 



