760 Mr. 0. Thomas on new 



adults, but quite light silvery grey in the young specimen. 

 Belly with but little buffy suffusion. 



Skull small, its brain-case ratlier shorter than in European 

 glareolus. 



Dimensions of the type (measured in flesh) : — 



Head and body 95 mm.; tail 50; hind foot 16 ; ear 13. 



Skull : condylo-basal length 23 ; zygomatic breadth 13 ; 

 nasals 6'2 ; interorbital breadth 3*6 ; brain-case, from line 

 at back of olfactory fossa to hinder edge of interparietal 

 10"8 ; palatilar length 11; palatal foramina i'S ; upper molar 

 series (crowns) 5*0. 



Hab. Syansk Mts., 100 miles W. of Lake Baikal. Alt. 

 IGOO'. 



Tt/pe. Adult female. Original number 163. Collected 

 7th June, 1910. 



This representative of E. gJareolus is quite unlike the 

 Central European forms of that species, but more resembles 

 the races inhabiting Scandinavia and Great Britain. It is, 

 however, distinguishable by the reduction of the rufous area 

 of the upper surface, the grey areas being larger, and by its 

 smaller brain-case. It seems to have no special relationship 

 to the Thian Shan species, E. centralis audfrater. 



Ochotona {Ogotoma) j}ricei, sp. n. 



A small pale species. Back of ear concolorous with 

 head. 



Most nearly related to 0. ladacensis and 0. pnllasi. Size 

 smaller than in those species. Fur of medium length ; hairs 

 of back (summer) about 14 mm. in length. General colour 

 above butfy (between " cream-buff" and " buff"), the brighter 

 parts on shoulders and rump quite " buff.'^ Extreme points 

 of hairs dark brown. Sides and under surface creamy 

 whitish, the plumbeous bases of the hairs showing through. 

 Crown stronger bufiy, almost tending towards ochracecus 

 buffy. A light creamy-buff collar between ears, perhaps 

 due to bleached winter hairs still in position. Ears with 

 outer side (ectote) grey, the edge cream-buff ; inner side 

 clothed with rather long (5 mm.) cream-buff hairs with dark 

 brown tips. Hands and feet cream-buff, palms and soles 

 similar, but darkened by the brown bases of the hairs showing 

 through. 



Skull with the same general characters as that of 0. imllasi 

 and ladacensis^ but smaller. Frontal profile less bowed, so 

 that the species tends to reduce the gap between Ogotoma and 

 Fika. iSIasals coalesced. Interorbital space narrow, but not 



