1897.] NATURAL SCIENCES OF PHILADELPHIA. 327 



greatest breadth, 23.8; length of nasals, 11.8; greatest length of 

 mandible, 22 ; frontal constriction behind post-orbital processes, 

 8.5 ; interorbital constriction, 7.5. 



General remarks. — A study of oregonensis, as represented by a 

 fair series of specimens extending from Tongas, Alaska, to northern 

 California, seems to indicate that three forms of this small, dark 

 colored type inhabit the Pacific Coast lands, the typical form found 

 from northern Oregon to southern Alaska being darkest and 

 brownest, becoming larger and more rusty northward, and smaller, 

 grayer and more tawny southward. Lack of specimens from the 

 two extremes of its distribution compel me to reserve a decision on 

 these points. In some respects the differences between oregonensis 

 and the other subspecies of alpinus recognized in this paper seem 

 almost specific, but in some of the specimens from intervening locali- 

 ties I find such a strong indication of intergrading with fuliginosus 

 that this separation seems unwarranted. 



Specimens examined. — Alaska, 2; British Columbia, 5; Wash- 

 ington, 4 ; Oregon 5 ; ? California, 1. 



