1905. } MAMMALS OF CHINA, 395 
lamin 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 the tooth-row, there are three 
cusps on both the first and second molars. 
MICROMYS SYLYATICUS CHEVRIERI (A. M.-E.). 
Mus chevriert A. Milne-Edwards, Rech. Mamm. p. 288, pl. xl. 
fig. 2 (1874); E. Biichner, Mamm. Przewalski, p. 92 (1889). 
Mus sylwaticus chevrieri (A. M.-E.), Barrett-Hamilton, P. Z.S8. 
1900, p. 418. 
Major Barrett- Hamilton, in the paper noticed above, restricts the 
name chevrieri to that form of Wicromys sylvaticus represented 
by tlie 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 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 8. 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, &c. 
MiCROMYS SYLVATICUS DRACO (B.-H.). 
Mus chevriert A. M.-E., Thos. P. Z. 8. 1898, p. 773. 
Mus , Sp. no. 27, Swinhoe, P. Z. 8. 1864, p. 382. 
Mus sylvaticus draco Barrett-Hamilton, P. Z. 8. 1900, p. 418. 
Mus badius Blyth, Swinhoe, P. Z. 8. 1870, p. 233. 
This form of Mus sylvaticus described by Major Barrett- Hamilton 
may be distinguished from Jicromys 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 sub- 
species.” 
Dimensions. Head and body 91 mm.; tail 95; hind foot 20. 
Skull. Greatest length 26mm.; basilar length 21; palatilar length 
11; diastema 7; iength of incisive foramina 5 ; length of nasals 10; 
interorbital breadth 5; breadth of brain-case 11; length of molar 
series 4. 
