MAMMALS FROM WESTERN CHIXA. 1 .S9 



Type. Adult male. B.M. No. 11.9.8.105. Original luuuher 

 2615. Collected 20 Xoveniber, 1910. 



This striking species, from the considerable altitude of 12,000', 

 is readily recognizable by its smooth flattened skull and long 

 tail, the latter character separating it at once fi-om A[. Irene^ to 

 which alone of the Chinese species hitherto described it has any 

 resemblance. 



In its possession of an extra angle on m' it has a cui'ious like- 

 ness to many of the species of Eothenomys and Caryomys, this 

 character in true Microtus being only hitherto known in 

 M. agrestis L. and sikimensis Hodgs, 



26. Microtus (Eothenomys) melanogaster eleusis. 



Thos. Abstr. P. Z.S. 1911, p. 50 (Oct. 31). 

 c?. 2694, 2695, 2696, 2700, 2703, 2704, 2709, 2710, 2711. 

 $ . 2699, 2702, 2705, 2706. 21 miles east of Chao-tung-fu, 

 N. Yunnan. 5800'. 



[? c? . 2571. Chin-fu-san. near Nan-schwan, S.E. Sze-chwaii. 

 4000'.] 



Longer-tailed than true ^nelanogaster, with more complicated 

 m\ 



General characters quite as in true melanogaster, though the 

 colour may average slightly more greyish brown. Head and feet 

 dark. Tail decidedly longer than in melanogaster, the shortest 

 measured 43 mm., the majority about 46 or 48, and the longest 

 55 ; on the other hand, in a number of m,elanogaster the majority 

 are 34-36, a single isolated example 43. 



Skull and teeth as in melanogaster, except that m^ is in nearly all 

 cases more complicated, the posterior U-shaped lobe being rather 

 a C, so that there are four inner salient angles instead of thi-ee. 



Dimensions of the type, measured in the flesh : — 



Head and body 98 mm. ; tail 55 ; hind foot 17 ; ear 11-5. 



Skull : condylo-incisive length 24'7 ; basilar length 22 ; zygo- 

 matic breadth 15 ; nasals 7'4 ; interorbital breadth 4*2 ; breadth 

 of brain-case 12'3 ; height of crown above alveolus of m" 7*7 ; 

 palatilar length 11-8; palatal foramina 5-1; upper molar series 

 (crowns) 5'6, 



Hah. East of Chao-tung-fu, N. Yunnan. 5800'. 



Type. Adult male. B.M. No. 11.9.8.111. Original number 

 2696. Collected 13 March, 1911. 



The Chin-fu-san specimen is a little indeterminate in character, 

 the teeth of the two sides not being quite alike. 



27. Microtus (Eothenomys) olitor. 



Thos. Abstr. P.Z. S. 191 1, p. 50 (Oct. 31). 

 S. 2718. ?. 2714, 2715, 2719, 2720, 2721, 2725. Chao- 

 tung-fu, Yunnan. 6700'. 



A short-tailed sepia-brown Evlhinomyti without supplementary 

 projection on m\ 



