230 



ON SMALL MAMMALS COLLECTED IN TIBET AND THE 

 MISHMI HILLS BY CAPT. P. M. BAILEY. 



By 



Oldfield Thomas. 

 (Fuhlished by permission of the Trustees of the British Musewn.) 



Through the kind offices of the Bombay Natural History Society 

 the National Museum has received a small series of Mammals 

 obtained by Capt. F. M. Bailey during his last expedition to Tibet 

 and the Mishmi Hills. The set includes several new and interest- 

 ing forms. 



The new Shrew from the Mishmis, Sorieulus bailey i, described in 

 a previous number of the Journal, was also obtained during the 

 same expedition. 



Genus Trogopterus. 



Capt. Bailey obtained a Flying Squirrel in the Ohumbi Valley of 

 a type quite new to India, but proving to be a member of the 

 Chinese genus Trogopterus. My examination of it has resulted in 

 finding not only that it forms a special subspecies, but that the 

 Chinese forms themselves need subdivision. 



Trogopterus mordax, sp. n. 



Size, as gauged by skull and teeth, markedly greater than in 

 T. xanthipes. 



-General size no doubt greater than in xanthipes, but no fresh 

 measurements available, hindfoot upwards of 55 mm. instead of 51. 

 Colour on the whole much as in T. xanthipes, though rather richer 

 and stronger, Undersurface similarly white washed with ochraceous. 

 Hands and feet rich fulvous or tawny. Ear region more strongly 

 tufted than in T. xanthipes, the longer bristles black, the tufts of 

 short hairs at the base of the ears fulvous. Sides of muzzle fulvous. 



Skull similar to that of T. xanthipes in all essential respects, but 

 larger throughout, as may be seen by the measurements below. 

 Bullse very much larger. P* even larger in proportion to the molars 

 than T. xanthipes. 



Dimensions of the type, those of an example of T. xanthipes 

 following in brackets : — 



Hindfoot 58 mm. (51). 



Skull, greatest length 62-3 (56-2) ; condylo-incisive length 56-S 

 (51); zygomatic breadth 37-7 (34-4); nasals 21 (18-3) x 11-2 

 (9-4) ; intertemporal breadth 10-6 (12); brain case, breadth above 

 meatus 28'5 (26-5) ; palatilar length 31 (28-2); length of bulla 14-4 

 (12-3) ; upper tooth-series 17-2 (15-2) ; length of p* 6-2 (5-4); molars 

 only 11 (9-8). 



