^[alnmtlh from Centrnl dwl Western Aaui. 7GI 



excessively so. Bulhtt partly visil)le L'roin above, the parietals, 

 owiii;^ to the lesser ohjitjiiity of the parietal plane, not com- 

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

 and palatal foramina completely separated, the latter sub- 

 equal in breadtii throuo;hout and abruptly truncated anteriorly, 

 as in O. pallusi\ not gradually narrowing forwartls as in 

 0. ladact'Hsis. Bull.o large, as in ( K pallasi. 



Dimensions of the type (measuretl in flesh) : — 



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



Skull ; occipito-nasal length -IfrS; condylo-incisive length 

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

 breadth 4-1; parietal breadth ID'G ; palatilar length 17*5; 

 palatal foramina 8*(3 ; upper cheek-tooth series (alveoli) 9'5. 



/fdb. jMountains W. of the Atehit Nor, in the Kobdo 

 ]?asin, N.W.Mongolia (about 9(P E., 49=^30' N.). Alt. 

 G700'. Another specimen from Suok, 8000'. 



2''i/pe. Adult female. Originul number 208. Collected 

 28th August, 1910, by Douglas Carruthers. Three speci- 

 mens examined. 



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

 Gra}', and 0. ladacensis, Giinth., but both are decidedly 

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

 profile. 0. ladacensis is also readily distinguishable by the 

 rufous or ochraceous backs to its ears. The summei" pelage 

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

 throughout, with but little tinge of bufTy. 



Ochotona dauurica allaina, subsp. n. 



Apparently quite similar to true dauurira, 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 4G ; condylo-incisive length 

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

 breadth 48 ; parietal breadth 18. 



Ilab. Atehit Nor, N.W. Mongolia. Alt. 4500'. Other 

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

 7000'. 



Ti/pe. Adult male. Original number 205. Collected 

 27tli August, 1910. Six specimens. 



The series of specimens have the hind foot measurements 

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

 from Taboul, ^lougoliau LMatcau, towards the eastern end of 



