108 Proceedings of the Biological Society of Washington. 



Subspecific characters. — Similar in size and coloration to O. saxatilis 

 saxatilis, but general tone of upperparts in summer pelage paler and less 

 tawny; in winter pelage more grayish and less ochraceous. Compared with 

 nigrescens: Upperparts paler and more buffy. 



Color. — Type (acquiring summer pelage) : General tone of upperparts 

 between cinnamon-buff and pinkish buff, moderately washed with fuscous 

 or fuscous-black; sides cinnamon-buff, shading posteriorly to pinkish buff; 

 rump (in worn winter pelage) smoke gray; ears chaetura black, margined 

 with buffy white and blotched on inner surface with the same color; feet 

 pinkish buff, washed with cinnamon-buff; soles chaetura drab; palms soiled 

 whitish, tinged with drab; underparts soiled whitish, washed with pinkish 

 buff. 



Skull. — Closely similar to that of saxatilis, but nasals averaging slightly 

 shorter. 



Measurements. — Type (adult 9): Total length, 202; hind foot, 33. 

 Skull: Occipito-nasal length, 46.8; zygomatic breadth, 22.5; breadth of 

 cranium, 19; interorbital breadth, 5.3; width of palatal bridge, 2.5; length 

 of nasals, 15.8. 



Remarks. — This form is closely related to saxatilis, of the Colorado 

 Mountains, but is widely different from nigrescens of the Jemez Mountains, 

 New Mexico. Its range includes the Pecos River, Taos, and Culebra 

 Ranges in northern New Mexico, extending, probably, into Colorado as 

 far as Sierra Blanca. 



Ochotona fenisex brunnescens, subsp. nov. 



Type. — No. 227,259, U. S. National Museum, Biological Survey collec- 

 tion; cT subadult, skin and skull; from Keechelus, Washington; collected 

 August 23, 1917, by George G. Cantwell; original number, 38 (19568, "X" 

 catalogue). 



Subspecific characters. — Similar (in winter pelage) to fenisex, 1 but upper- 

 parts decidedly browner (less grayish) and underparts more buffy. 



Color. — Type (in fresh pelage, August 23) : Upperparts mixed cinnamon 

 and fuscous, the general tone near snuff brown; sides deep pinkish cinna- 

 mon, shading to light pinkish cinnamon; ears chaetura black, margined 

 with buffy white; feet soiled whitish, washed with light pinkish cinnamon; 

 soles chaetura black; palms hair-brown; underparts light pinkish cinnamon. 



Skull.— Similar to that of fenisex but averaging larger, with relatively 

 shorter nasals. 



Measurements. — Type (subadult c?): Total length 200; hind foot, 33. 

 Skull: Occipito-nasal length, 42.9; zygomatic breadth, 22.1; breadth of 

 cranium, 18.4; interorbital breadth, 5.6; width of palatal bridge, 2.6; length 

 of nasals, 14.1. 



Remarks. — The Cascade pika is a strongly marked race, and has an 

 extensive range on the high Cascades, from the vicinity of Chilliwack in 



lAs distinguished by specimens from near Okanagan, British Columbia, and Horse- 

 shoe Basin, near Mt. Chopaka, Washington. 



