180 Records of the Indian Museum. [Vol, XV, 



Mag. (8), I, p. 7) in having the palate breadth between the large pre- 

 molars {pm. — ) only equal to the length of 2JW*+| tn^- 



The Assam example (9489, cotype of villosus : 9488 having no skull) 

 has rather smaller teeth' and possesses the characters given for tricliotis, 

 Thomas, of Manipur, in having the palate breadth equal to the length 

 of "pm^^m^, as does that of the Cachar specimen (9771) which resembles 

 it generally ; but the second Assam skull (9769), which also has about 

 the same ratio of palate breadth to tooth row, is otherwise very different 

 from all the rest in being larger with a much heavier, blunter rostrum ; 

 considerably greater breadth in general and larger, markedly broader 

 teeth ; it is however the oldest of the lot. 



The Naga Hill skull (9770) more nearly resembles 'pearsoni. 



The only Momein skull (9758) agrees with the majority in form, 

 except that the bullae seem smaller, but it has the proportion of palate 

 breadth to teeth as in pearsoni ; it has however teeth nearly as broad as 

 No. 9769 of Assam, with the longest tooth row of all and prn^ very large 

 indeed — larger than in pearsoni. 



The skins are in poor condition but do not seem separable on colour ; 

 either, however, too many forms have been recognised, or not enough. 



Genus PTEROMYSCUS, Thomas, 1908. 

 Pteromyscus pulverulentus. 



a. pulverulentus pulverulentus (Gunther). 



p. Z. S., 1873, p. 413, pi. xxxviii. 



Typical locality. — Penang. 

 Type. — In British Museum. 



b. pulverulentus borneanus, Thos. 



Ann. Mag. Nat. Hist., (8), I, p. 17 (1908). 



Typical locality. — Baram, Sarawak. 

 Type. — In British Museum. 



Genus PETAURILLUS, Thomas, 1908. 

 Petaurillus hosei (Thos). 



Ann. Mag. Nat. Hist., (7), V, p. 275 (1900). 



Typical locality. — Baram, Sarawak. 

 Type. — In British Museum. 



Petaurillus emlliae, Thos. 



Ann. Mag. Nat. Hist., (8), I, p. 8 (1908). 



Typical locality. — Baram, Sarawak. 

 Type. — In British Museum. 



