PRELIMINARY DESCRIPTIONS OF NEW RODENTS FROM THE 

 OLYMPIC MOUNTAINS. 



Sciuropterus alpinus olympicus. 



Type. Happy Lake, Challam Co., Olympic Mountains ; 

 about 5,000 feet. Collected Sept. 9, 1898. 



Characters. Similar to S. a. fuloginosus Rhoads, but larger and 

 very much darker coloration. 



Color. Head, back, shoulders and sides, blackish-slate al- 

 most pure black, the hairs tipped with rust color; in no way re- 

 sembling the broceoli-brown of Rhoads' sub-species, and giving 

 the upper part a rusty hue. Wing membranes jet black on their 

 outer half, edged with white, inner half like back. Basal portion 

 of tail, above, grayish-fawn, growing dark toward the end, which 

 is a dark smoky gray; beneath buff, with a central line of dark 

 gray. Entire under surface of body and flying membrane, bright 

 buff, slate color of under fur showing through; legs and feet, 

 dark reddish brown; ears, dark brown, inclining to blackish at 

 the edges, nose and stripe to eye, and ring around eyes, black; 

 sides of face, gray. 



Cranial Characters. Skull long for its width, being 41 mm. 

 from occiput to end of nasals, and 19 mm. greatest width; na- 

 sals, 12 mm.; tooth row, 9. 



Measurements. Total length, 346 mm.; tail, 164; hind leg, 38; 

 flying membrane, across shoulders, extended 200 mm. 



Phenacomys olympicus. 



Type. Happy Lake, Challam Co., Washington. Altitude 

 about 5,000 feet. Collected August 14, 1898. 



Smaller than/*, orophilus, but with a comparatively longer tail, 

 and with a darker colored pelage. 



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