OCR Text |
Show 1 9 0 5 .] MAMMALS OF CHINA. 3 9 5 laminae of the first and second upper molars have each an additional internal cusp beyond the number present in Mus, so that, counting along the inner side of tlie tooth - row, there are three cusps on both the first and second molars. M icrom ys s y l v a t ic u s c h e v r ie r i (A. M.-E.). Mus chevrieri A. Milne-Edwards, Rech. Mamm. p. 288, pi. xl. fig. 2 (1874); E. Buchner, Mamm. Przewalski, p. 92 (1889). Mus sylvaticus chevrieri (A. M.-E.), Barrett-Hamilton, P. Z. S. 1900, p. 418. Major Barrett-Hamilton, in the paper noticed above, restricts the name chevrieri to that form of Micromys sylvaticus represented by the typical series from Moupin in Tibet. Tlie general colour is pale fawn, grizzled with brownish on the back. The under parts and feet are pure white. Tail about equal in length 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. So little is known of this species that it is impossible to add anything in reference to its habits, Ac. M icromys s y l v a t ic u s 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. Mus badius Blyth, Swinhoe, P. Z. S. 1870, p. 233. This form of Mas sylvaticus described by Major Barrett-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 parts 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 describer, 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 subspecies." Dimensions. Head and body 91 mm.; tail 95 ; hind foot 20. Skull. Greatest length 26 mm.; basilar length 21; palatilar length 11 ; diastema 7; length of incisive foramina 5 ; length of nasals 10 ; interorbital breadth 5 ; breadth of brain-case 11 ; length of molar series 4. |