S58 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXVI. 



Gen. IV. — Pteromys. 



Thomas lias divided this genus up into four subgenera, three 

 ■onh^of which are found in Indian limits. One of these, Glaucomys, 

 has been restricted bj^ Hollister (P. Biol. Soc. Wash, xxviii, p. 109, 

 1915) to the American form. These three subgenera may be 

 arrans-ed in a kev as follows : — 



Key to the subgenera of Pteromys. 



^. — Bullae well inflated ; molar ridges high. 



a. Mammae 8 I. Eoglaucomys. 



b. Mammee 6 11. Hylopetes. 



B. — Bullae low, flat, little inflated ; molar 



ridges low HI. Petinomys. 



Subgen. I. — Eoglaucomys. 



No. 233. fimbriatus, Gray. The only species. 



Distribution : — 



Pt. {E.) fimbriatus, QfV&j. Ttjpelocalittj :—'' India." ^ 



Other localities : — Kashmir, Simla, 

 Thandeani, Garial, Murree, Punjab 

 (B. M.). 

 Type: — Not traced. 



Subgen. II. — Hylopetes. 



The sagitta of Linnaeus was based 

 No. 234. alboniger, Hodgs. on a Sumatran animal ; for its 

 No. 235. sagitta, L. Burmese representative Blyth esta- 



No. 236. spadiceus, Blyth. blished the species phayrei from 



Mergui. For the still more North- 

 em form from Mt. Popa Thomas has provided the subspecific name 

 probus. In 1908 Thomas established belone for the small flying 

 squirrel of the Malay Peninsula, which has now been taken in 

 Tenasserim. The species may be distinguished as follows : — 



Key to the species of Hylopetes. 



A. — Size larger, hindfoot about 40 mm. ... 1 alboniger, Hodgs. 

 B. — Size smaller, hindfoot 30 mm. or less. 

 a. Size medium, hindfoot aboiit 30 mm. 



a^. Feet entirely brown ... ... 2. phayrei, Bl. 



b\ Sides of feet and toes pure white... 3. p. probus, Thos. 



