1878.] W. T. Blanford — On some Mammals from Tenasserim. 165 



Pteromys cineraceus. 



Blyth, J. A. S. B., XVI, p. 865 ; XXVIII, p. 276 ; XLIV, Pt. 2, Extra number, 

 p. 35. 



A fine female skin from WImpong, 15 miles from Thatone, (west 

 of the Salween) has the tip very little darker than the remainder of 

 the tail, and is easily distinguished from P. oral of Southern India by its 

 greyer colour, and by the lower parts being white. The following are the 

 dimensions noted by Mr. Davison on the fresh specimen. 



in. 



Length from nose to anus, 18'5 



„ of tail from anus, 22*5 



„ of hairs at end of tail, 3- 



Total 44-0 



Length of fore foot (without claws), 2-4 



„ of hind foot and tarsus (do.,) 3* 



Height of ear outside, 15 



„ inside from orifice, 2* 



Rhizomys castaneus. 

 Blyth, J. A. S. B., XII, p. 1007 ; XLIV, Pt. 2, Extra number, p. 41. 



A specimen from Thatone in Martaban, west of the Salween river, and 

 another from, 1 believe, the same neighbourhood, differ from Arakan and 

 Pegu specimens by having a white spot in the middle of the forehead, as in 

 some other species of the genus. As there appears no other distinction, 

 and as the spot is evidently variable, being far more distinct in one speci- 

 men before me than in another, I do not think this form is more than a 

 variety. 



Mus robustulus. 



Blyth, J. A. S. B,, XXVIII, p. 294 ; XLIV, Pt. 2, Extra number, p. 39. 



Specimens in spirit from near Maulmain collected by Mr. Limborg do 

 not appear to me distinct from the common tree rat of lower Bengal, 

 M. rufescens of Blyth and Jerdon, but not, I think, of Gray, as in the origi- 

 nal description by the latter the tail is said to be shorter than the body, 

 whereas in both the Bengal and Burmese rats the tail exceeds the head and 

 body in length. I can see no difference in the skulls of the Bengal and Te- 

 nasserim rats. 

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