Mammals from Central and Western Asia. 761 



excessively so. BuIUb partly visible from above, the parietals, 

 owing to the lesser obliquity of the parietal plane, not com- 

 pletely hiding them as is the case in 0. ladacensis. Incisive 

 and palatal foramina completely separated, the latter sub- 

 equal in breadth throughout and abruptly truncated anteriorly, 

 as in 0. pallast, not gradually narrowing forwards as in 

 0. ladacensis. Bulire large, as in (). pallasi. 



Dimensions of the type (measured in flesh) : — 



Head and body 178 mm.; iiind foot 29*5 ; ear 20. 



Skull ; occipito-nasal length 4(3'8 ; condylo-incisive length 

 43*6; zygomatic breadth 24; nasals 15'8; interorbital 

 breadth 4*1; parietal breadth 19*6; palatilar lengtii 17'5 ; 

 palatal foramina 8*6 ; upper cheek-tooth series (alveoli) 9'5. 



Ilab. Mountains W. of the Atcliit Nor, in the Kobdo 

 Basin, N.W.Mongolia (about 90° E., 49° 30' N.). Alt. 

 6700'. Another specimen from Suok, 8000'. 



Type. Adult female. Original number 208. Collected 

 28tli August, 1910, by Douglas Carrutbers. Three speci- 

 mens examined. 



The only near relatives of this pretty Pika are 0. pallasi, 

 Gray, and 0. ladacensis, Giinth., but both are decidedly 

 larger, and have their skulls more " humped " in the frontal 

 protile. 0. ladacensis is also readily distinguishable by the 

 rufous or ochraceous backs to its ears. The summer pelage 

 of 0. pallasi is unknown, but in the winter coat it is greyish 

 throughout, with but little tinge of buffy. 



Ochotona dauurica altaina, subsp. n. 



Apparently quite similar to true dauurica, with the ex- 

 ception that the feet are larger. Colour averaging a little 

 paler and greyer. Under surface rather whiter, the hairs 

 with a longer slaty basis. Skull slightly larger. 



Dimensions of the type (measured in flesh) : — 



Head and body 182 mm. ; hind foot, s. u. 32-5, c. u. (on 

 skin) 37 ; ear 22-5. 



Skull : occipito-nasal length 46 ; condylo-incisive length 

 44-2 ; zygomatic breadth 23 ; nasals 16 ; interorbital 

 breadth 48 ; parietal breadth 18. 



Bab. Atchit Nor, N.W. Mongolia. Alt. 4500'. Other 

 specimens from Suok on the eastern slope of the Great Altai, 

 7000'. 



Type. Adult male. Original number 205. Collected 

 27th August, 1910. Six specimens. 



The series of specimens have the hind foot measurements 

 (s. u.) as follows : 29, 29, 30, 305, 31, 32-5 mm., while a set 

 from Taboul, Mongolian Plateau, towards the eastern end of 



