PTEEOMYS. 289 



in others. The teeth in young individuals are rather strongly tubercular, but they 

 gradually become worn with use and the tubercular character disappears, which is a 

 generic character. 



This flying squirrel has been found in Nepal and the neighbouring region of 

 Sikkim. 



Pteromys leucogenys, Temminck. 



Fteromys leucogeni/s,Tlem.mmQk, Monogr. Mamm, Tab. Method, vol. i. 1827, p. 27; Temm. and 

 ScUegel, Fauna Japonica, Mamm. 1847, p. 46, tab. xiii. ; Is. Geoff. St.-Hil. Diet. Class, vol. xiv. 

 1828, p. 13] ; Schinz, Syn, Mamm. 1845, vol. ii. p. 527. 



This is a large squirrel with a rather shorter tail than the generality of the 

 allied forms P. caniceps and P. oral, to which it is closely allied. 



The fur is very soft and long, and the basal two-thirds of the hairs are slate 

 or mouse coloured, passing into pale brownish-yellow in the lower portion of the 

 terminal third, then into brownish, which is followed by a broad pale yellow band 

 which is tipped with dark brown. These yellow bands are not so prevalent as to 

 hide the underlying dark-brown and greyish, except on the anterior half of the 

 body, which is pale yellow -brown, the hinder half having a grizzled appearance on 

 a brownish slaty background. The head is concolorous with the front upper parts, 

 but much more finely grizzled, and passes into pale violet-grey between the eyes, 

 and on the upper surface of the nose. Prom the nose to the eye, and around and 

 below the latter, the hair is dark rusty-brown. The upper lip and the area in 

 front of and below the ear are pale violet-grey. The chin is dark brown. The 

 under parts are pure snow-white, densely clad with fine fur, the white passing 

 into orange on the under surface of the membrane. The inside of the front limb is 

 brownish-black in its posterior half and orange-white anteriorly. An orange line 

 runs from the front margin of the fore limb, bordering the white under parts, 

 to the chin. The upper surface of the limbs is blackish-brown. The ears are 

 clad with long hairs, and the whiskers or cheek-bristles are feeble. The tail is 

 bushy and brownish -black, and the hairs slaty at the base, then yellowish-brown 

 succeeded by the broad dark-brown tips, many of these near their extremities 

 being broadly banded with yellowish. The greater part of the tarsus of this 

 species, as in P. melanopterus and P. xanthipes, is densely clad. 



The skull has a rather long and narrow muzzle, and it is very like the skull 

 of P. caniceps. 



Inches. 



Length of body 18*00 



tail 11-50 



This species inhabits Japan. 



n2 



