MAMMALS FROM WESTERN CIIIXA, 175 



Upper incisors narrow, considerably lievelled latei-nlly. 



Molars of normal structure, the pafcterii of tlie upper ones, so 

 far as spaces and angles are concerned, essentially as figured by 

 Blasius (p. 379) in M. arvalis, though the posterior lobe of m'' is 

 rather narrower and more elongated. Lower teeth as figured by 

 the same author (p. 366) in M. rattiaqjs, m^ with a very similar 

 anterior lobe and the same number of closed triangles. 



Dimensions of the type : — 



Head and body 103 mm. ; tail 40 ; hind foot (c. u.) 17 ; ear 13, 



Skull : condylo-basal length 26*2 ; basilar length 23*5 ; greatest 

 breadth 15 ; nasals 7 ; interorbital breadth 3"7 ; breadth of brain- 

 case 12 ; height of crown from alveolus of m'"^ 9'2 ; palatilar length 

 13'2 ; diastema 8'3 ; palatal foramina 5 ; diagonal length of bulla 

 in horizontal plane 8"2 ; upper molar series (crowns) 6'1. 



Other specimens are smaller, the smallest adult having a 

 condylo-basal length of 23'4, with a hind foot of 16 mm. 



Hab. as above. 



Type. Adult male, B.M. No. 11.2.1.199. Original number 2245. 

 Collected 4 April, 1910. 



I can find no described species to which this Vole can be 

 assigned. Its high skull separates it at once from the great 

 mass of flat-skulled Yoles, the shape more recalling that in 

 Af. calamontm, a species possessing a lateral gland and only five 

 foot-pads. Satunin's three species from Zaidam, W. of Kan-su, axe 

 all markedly larger than M. mcdcolmi. Buchner's M. limnophUns 

 from the same district is perhaps more closely allied, but would 

 seem to have a paler general colour and a much more roughened 

 and angular skull. 



37. MiCROTUs (Anteliomts) chinensis Thos. 



c?. 2328, 2329, 2332, 2338, 2339. $. 2326, 2327, 2331, 

 2333, 2334,' 2335, 2340, 2341. 23 miles S.E. of Ta-tsien-lu. 

 10,000'. 



cf. 2512, 2519, 2534, 2543, 2544. 9. 2491, 2492, 2528, 

 2551, 2553. Omi-san. 9500'. 



This striking Vole was described in 1891 * from a specimen 

 found in the stomach of a snake. No other examples have been 

 obtained until now. 



The type-locality was Kia-ting-fu, quite close to Omi-san. 



38. MiCROTUS (CaRYGMYS) EVA. 



Thos. Abstr. P. Z. S. 1911, p. 4 (Feb. 14). 

 d. 2238, 2239. o. 2240, 2241. Mts. S.E. of Tau-chow, 

 Kan-su. 10,000'. 



[Caryomys, 



Like Eothenomys in external and general ci^anial characters, 

 but the teeth with the triangles nearly all closed, instead of being 

 mostly open and connected with each other. Additional postero- 

 * Ann. Mng. N. H. (6) viii p. 117, 1891. 



