Vol. 32, pp. 105-110 May 20, 1919 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTIONS OF NINE' NEW NORTH AMERICAN 



PIKAS. 



BY ARTHUR H. HOWELL. 



Study of the North American pikas of the genus Ochotona 

 has resulted in the discovery of a number of new forms, nine of 

 which are here named in advance of a revision of the group now 

 in preparation. 



Ochotona princeps lutescens, subsp. nov. 



Type. — No. 108,650, U. S. National Museum, Biological Survey collec- 

 tion; adult J', skin and skull; from Mt. Inglesmaldie, near Banff, Alberta; 

 collected July 26, 1899, by G. F. Dippie; original number 193 (2973, "X" 

 catalogue). 



Suhspedfic characters. — Similar to princeps, but smaller; coloration de- 

 cidely paler, both above and below. 



Color.— Type (acquiring summer pelage) : Upperparts mixed pinkish buff 

 and fuscous, darkest in the middle of the back, shading to clear pinkish 

 buff along sides; hinder back (in worn winter pelage) smoke gray, blotched 

 with pinkish buff and fuscous; ears hair-brown, broadly margined with 

 Ught buff and clothed inside with buffy white hairs; feet creamy white, 

 faintly washed with pinkish buff; soles drab; palms pale ohve-buff; under- 

 parts creamy white, faintly washed with pale pinkish buff, chiefly along 

 median line. 



SkvU. — Averaging decidedly smaller than that of princeps, with shorter 

 nasals. 



Measurements. — Average of 8 adults (4 males, 4 females) from Canmore, 

 Alberta: Total length, 177 (170-188); hind foot, 29.4 (26-31). SkvM (of 

 type, adult male): Occipito-nasal length, 43.3; zygomatic breadth, 21.6; 

 breadth of cranium, 18; interorbital breadth, 5.3; width of palatal bridge, 

 2; length of nasals, 13.9. 



Remarks. — This race is a strongly characterized form occupying, ap- 

 parently, the ranges in southern Alberta lying to the eastward of the main 

 divide of the Rocky Mountains. A considerable series has been examined 

 from the vicinity of Banff, and a few from Mt. Forget-me-not, Alberta. 

 18— Pboo. Biol. Soc. Wash., Vol. 32, 1919. (105) 



