792 JOljRNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXVI. 



6^ Mammge 2 — 2=8. 



a. Size large, hind-foot 45 mm. or 



more ... ... ... ... 15. vociferans. Mill. 



b'. Size smaller, hind-foot less than 

 40 mm. 

 a\ Coat harsh and spiny. 



a*. Colour dark brown ... 16. mentosus, Thos. 



b\ Colour ochraceons ... 17. surifer, Mill. 



h\ Coat soft and silky. 

 a\ Colour schraceous. 



a\ Larger, head and body 

 130—140 mm. hind- 

 foot about 30 mm. ... 18. fulvescens, Gray. 



6^ Smaller, head and body 

 110—115 mm. hind- 

 foot about 25 mm. ... 19. eha, Wroughton. 



b\ Colour dark grey-brown. 



a\ Belly pure white ... 20. niviventer, Hodgs. 



b\ A dark gorget and 



median streak ... 21. lepcha, Wrough- 



DiSTRiBUTiON : — ton. 



1. R validus, Miller. Type locality:— Trong, 1,000', 



Lower Siam. (Abbott). 



OtJier localities : — Malay Peninsula 

 (B. M.) ; Tenasserim (M. S. I.). 



Type :_U. S. Nat. Mus. No. 86741 . 



2. R. andamanensis, Blyth. Type locality : — Andaman Islands. 



(Hodgs.). 



Other localities :— Andamans (B.M.). 



Co-types:— B.M.l^os. 81.11.10.3 

 and 4, and Ind. Mus. Calc. Nos. a. 

 and b, 



3. R. rattus, group. The members of this group, as 



recently accepted by Hinton (J. B. 

 N. H. S. xxvi., pp. 59, 384), may be 

 arranged in a key as follows : — 



Key to the members of the R. rattus group. 



I. — Tail shorter, averaging less than 120 ^ 

 of head and body. 

 A. — Tail relatively short, averaging 

 about 108 % or less, of head and body. 

 a. Tail scarcely longer than head and 

 body ; fur short and thin ; under- 

 side not silvery, frequently with 

 a rusty tinge ... ... ... ('a) n. obsoletus, Hint. 



