394 Mr. O. Thomas on 



Skull in general character quite the same as in erythro- 

 qenys, with the same widely expanded zygomata, but con- 

 siderably smaller throughout. 



Dimensions of the type (measured in flesh) : — 



Head and body 197 mm. ; tail 42 ; hind foot 34 ; ear 8. 



iSkuU : greatest length 45"2 ; condylo-iiicisive length 42 ; 

 zygomatic breadth 30*4; nasals lG"5x6"8; interorbital 

 Ineadth 8*3; posterior breadth on tympanies 24; palatilar 

 length 22*6 ; diastema 10-5 ; palatal foramina 2'8 ; upper 

 tootii series exclusive of small premolar 9*2. 



Hah, as above. 



Type. Young adult female. B.l\r. no. 12. 4. 1. 34. 

 Original number 282. Collected 19th June, 19J1. 



This Barlik souslik may have been included by other 

 authors under C. erythrogenys, but a comparison of ^Ir. Car- 

 rufhers's very uniform series with some specimens from Biisk, 

 obtained and presented by Mr, J. H. Miller in 1908, siiows 

 at once that there are two members of the group, diflfering 

 buth in size and the number of their mammre. 



The original eri/throjenys of Brandt was first described as 

 from the Altai (Gebler), and later on the Alai Kiver was 

 mentioned as its habitat. This river runs into the Ob at 

 Barnaul, and is not far from Biisk, so that our specimens 

 from the latter place may be provisionally accepted as 

 typical. 



I have named this distinct species in honour of its disco- 

 verer, Mr. Carruthers, to whose hard work and enthusiasm 

 tiie present fine collection is due. 



11. Marmota centralis, Thos. 



?c?. 228. Kran Valley, Great Altai. 2300'. 

 ? . 291. Barlik Mts., N.W. Dzungaria. 7300'. 

 (J. 3U0, 301, 302. Ala-tau Mts., N.W. Dzungaria. 

 6500-7000'. 



12. Dyromys milleri, sp. n. 



? . 255. Bogdo-ola Mts., S.E. Dzungaria. 5000'. 

 9th May, 1911. B.M. no. 12. 4. 1. 43. Type. 



Near" D. angehis, but with more rounded bruin-case and 

 smaller bulla?. 



Size rather less than in D. angehis. General colour above 

 wood-brown tinged with fulvous, more fulvous on crown ; 

 greyer on sides. Under surface broadly washed with creani- 

 butf', the edges of the upper colour more strongly buify. Top 

 of muzzle greyish white, cheeks cream-buff, sharply defined ; 



