306 MR. J. L. BONHOTE ON MAMMALS FROM TIBET. [Nov. 14, 



represented in the collection by two spirit-specimens, one of 

 which has since been skinned. It appears, although closely 

 I'elated to Cricetuhis ])Jueit,s, to have been hithei-to undescribed. 



Size abont that of C j^'hrnus. General colour above pale fulvous 

 grey, greyer than in C. jiihceus. 



Each hail' is slate-grey at its base, fulvous for about \ of its 

 distal end and with a black tijo. Ovei- the head and fore part of 

 the body the fidvous poi'tion of each hair is the more conspicuous, 

 but on the hinder part of the back the dark tips predominate and 

 a faint dark median dorsal line may be traced. The undei'pai-ts 

 are pure white, the hairs being slate-grey at their base. The line 

 of demarcation between the upper and under parts, although 

 abrupt, is A^ery uneven in outline. The feet are but scantily 

 clothed wdth hair and are white. The tail is moderately long 

 and stout, well clothed with dark brown hairs above and white 

 hairs below ; the tip is white. 



The whiskers are for the most part black with a white tip, 

 some shorter ones, however, being entirely white. 



The skull I'esembles somewhat closely that of C phm'tis^ but is 

 slightly larger and the brain-case more inflated and rounder. 

 The chief points of difference, when viewed from below, are the 

 greater width of the basioccipital and the much flatter and smalJei' 

 bullae in the new species. Above there is a slight, although veiy 

 constant, difference in the hinder margin of the pai'ietals, which 

 are j)ractical]y straight in outline ; whei'eas in G. plimus there is a 

 sharp turn backwards when about two-thii-ds of their length from 

 the middle line. 



Dimensions (of tyj)e when in spirit). Head and body 87 mm. ; 

 tail 40; hind foot 17; ear 16. 



Skull. Greatest length 28*5 mm. ; basal length 24 ; palatal 

 length from henselion 12 ; interorbital breadth 5 ; greatest 

 )>readth of brain-case 12 "5; width of basioccipital at anterior end 

 of auditory bullpe 3. 



Habitat. Lhasa-, Tibet. 



Ihjpe. B.M. 5.4.6.4. Collected at Lhasa, Tibet, by Capt. H. 

 J. Walton, I.M.S. 



The darker colour of the hinder part of the back combined 

 with the general much greyer coloration, and in addition the 

 somewhat longer and stouter tail, form characters by which this 

 species may be distinguished from C. j^hceus. The animal, ac- 

 cording to Capt. Walton, was extremely common, and was 

 swarming in one of the shrines of the Jo Khang Cathedj-al at 

 Lhasa. 



MicROTUs (Phaiomys) waltoni. 



Microtus {Fliaiomys) xvaltoni Bonhote, Abstr. P. Z. S. JS^o. 22, 

 p. 14, Nov. 21, 1905. 

 a. § ad. Lhasa, Tibet. 

 Slightly smaller in size than Ph. hlythi, to which it is by skull- 



