84 Bangs — Description of a New White-footed Mouse. 



P. canadensis abietorum Bangs. 



Hudsonian and upper Canadian Zones of eastern North America. 



P. canadensis umbrinus Miller. 



North shore of Lake Superior. 



P. canadensis nubilerrie Rhoads. 



Higher Alleghany Mountains of North Carolina, Tennessee, West 

 Virginia, and northward to Pennsylvania. 



Peromyscus oreas * sp. now 



Type from Mt. Baker Range, 49th parallel, British Columbia. Altitude, 

 6500 ft. No. 3696, 9 ad., coll. of E. A. and O. Bangs. Collected August 

 29, 1896, by Allan C. Brooks. 



General characters. — Size medium (smaller than P. macrorhinus) ; color 

 of upper parts rich reddish-brown ; skull smaller and less exaggerated in 

 character than that of P. macrorhinus. 



Color. — Upper parts in adult, rich brown (varying from Prouts' brown 

 to russets), slightly darkened along middle back by the admixture of black- 

 tipped hairs, forming an indistinct darker dorsal stripe; orbital ring black, 

 narrow, and inconspicuous ; under parts dull white, the plumbeous under 

 fur showing through ; feet and hands white; ears large, dusky, in fresh 

 pelage with narrow white edges; tail long, sharply bicolor, black above, 

 white below, a long pencil at end. Younger individuals are somewhat 

 darker and less reddish brown above. 



Oranial characters. — The skull is smaller than that of /'. macrorhinus, 

 but has the flat, broad braincase and long slender rostrum peculiar to the 

 group. These characters are rather less pronounced in J', oreas than in 

 P. macrorhinus. 



Measurements. — Type, 9 ad.; total length, 200; tail vertebra 1 , 101; 

 hind foot, 24. Topotype, No. 3694, ,-f ad.: total length, 207; tail ver- 

 tebrae, 114 ; hind foot, 24. 



Skull of type, \ ad.: basilar length of Hens'el, 20.6; zygomatic breadth , 

 13.4; incisors to postpalatal notch, 10.8; length of nasals, 11.8. 



Remarks. — P. ureas appears to be specifically distinct from P. austerus, 

 the smaller and very much darker form of the adjacent lowlands. 



Mr. Brooks took /'. austerus at Sumas, B. C. ; while in the high moun- 

 tains of the Mount Baker range he got P. oreas. I have also a series of 

 fifty specimens of /'. oreas taken in the mountains above Hope, B. C, in 

 1<S<»4, by Will C. Colt, These are exactly like the Mount Baker exam- 

 ples, and it is therefore probable that /'. oreas occupies all the higher 

 mountains of northern Washington and southern British Columbia. 



It is probable that P. oreas intergrades with J', macrorhinus. It is dis- 

 tinguished from that form by smaller size, more reddish brown color, and 

 smaller skull, with the peculiar characters less exaggerated. With the 

 enormous /'. sitkensis, it needs no comparison, nor does it with /'. keeni, the 

 type of which I have examined and found to be quite close to /'. austerus. 



* Oreas = a mountain nymph, Oread. 



