760 Mr. O. Thomas 0)i new 



adults, but quite light silvery grey iu the youug specluien. 

 Belly with but little butFy suffusion. 



(Skull small, its brain-case rather shorter than in European 

 glareolus. 



Dimensions of the type (measured in flesli) : — 



Head and body 95 mm.; tail 50; hind foot lb; 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 4*8; upper molar 

 series (crowns) 5*0. 



Hah. 8yansk Mts., 100 miles AV. of Lake ]}aikal. Alt. 

 ICOO'. 



Type. Adult female. Original number 163. Collected 

 7th June, 1910. 



This representative of E. glareolus 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 u|)per surface, tiie grey areas being larger, and by its 

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

 to the Thian Shan species, E. centralis and f rater. 



Ochotona {Ogotoma) pricei, sp. n. 



A small pale species. Back of car concolorous with 

 liead. 



Most nearly related to 0. ladacensis and (>. pallasi. Size 

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

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

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

 j)arts on shoulders and rump quite '' buff.'^ Extreme points 

 (if hairs dark brown. Sides and under surface creamy 

 whitish, the j)lumbeous bases of the hairs showing through. 

 Crown stronger buffy, 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 lips. 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 (.'. pallasi 

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

 that the species tends to reduce the gap between Ogotoma and 

 Pika. iSasals coalesced. Interorbital space narrow, but not 



