1905.] MAMMALS OF CHINA. 395 



laminae of the first and second upper molais have each an 

 additional internal cusp beyond the number present in Mus, so 

 that, counting along the inner side of the tooth row, there are three 

 cusps on both the first and second molai^s. 



MiCEOMYS SYLVATICUS CHEVRIERI (A. M.-E.). 



2Ius chevrieri A. Milne-Edwards, Rech. Mamm. p. 288, pi. xl. 

 fig. 2 (1874) ; E. Biichner, Mamm. Przewalski, p. 92 (1889). 



Mus sylvaticus chevrieri (A. M.-E.), Bari-ett- Hamilton, P. Z. S. 

 1900, p. 418. 



Major Barrett- Hamilton, in the paper noticed above, i*estricts the 

 name chevrieri to that form of Micromys sylvaticus repi'esented 

 by the typical series from Moupin in Tibet. 



The general colour is pale fawn, grizzled with brownish on the 

 back. The under parts and feet are pure white. Tail about equal 

 in leng-th to the head and body, bicoloured and scantily clothed 

 with hair. 



Dimensions. Head and body 100 mm. ; tail 90; hind foot 

 21 "5 mm. 



Habitat. Moupin, Tibet. A single specimen in the British 

 Museum from S. Shensi is probably referable to this species. 



iSo little is known of this species that it is impossible to add 

 anything in reference to its habits, &,c. 



Micromys sylvaticus draco (B.-H.). 



Mus chevrieri A. M.-E., Thos. P. Z. S. 1898, p. 773. 



Mus , sp. no. 27, Swinhoe, P. Z. S. 1864, p. 382. 



Mas sylvaticus draco Barrett-Hamilton, P, Z. S. 1900, p. 418. 



Mm hadius Blyth, Swinhoe, P. Z. S. 1870, p. 233. 



This form of Mus sylvaticus described by Major BaiTett- Hamilton 

 may be distinguished from Micromys chevrieri by its duller colour 

 and its slightly smaller size. The general colour is pale fulvous 

 (hair-brown, Ridgw.), darker along the median dorsal area owing to 

 many of the hairs having black tips. Feet and under pai'ts pure 

 white. Tail well clothed with short hair, dark above and light 

 below. The bases of the hairs on all parts of the body are slate- 

 coloured. 



According to the original desciil^er, the skull is " narrower and 

 slightly smaller than that of the adult of the subspecies intermedius 

 (of Britain and portions of "Western Europe), and having the 

 anterior portions of the frontals more attenuated and the nasal 

 region proportionately more slender than in the latter sub- 

 species." 



Dimensions. Head and body 91 mm. ; tail 95 ; hind foot 20. 



Skidl. Greatestlength26mm.; basilar length 21 ; palatilar length 

 11 ; diastema 7; length of incisive foramina 5 ; length of nasals 10 ; 

 interorbital breadth 5 ; breadth of brain-case 1 1 ; length of molar 

 series 4. 



