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



Average of 17 :— 164—198—32.2-22.1. 



„ % ofhead and body :— 100—121—19.6-13.5 

 Pagan (B. M. serial No. 14.7.19.)— 



125—158—30—20 



153—189—30—20 



168—196—31.5-22 



1916 156— 180— 32— 20-5 

 171_214— 33— 22 

 164—205—31—20 

 159—188—32—22 

 162— —33—22 

 Average of 5:— 162— 197— 32-2-21-3 



„ X of head and body :— 100— 121— 19-9-13-2 



The skull and teeth are of normal form ; the cranial dimensions 

 are given in the tables I {e) and II {e) in part III. The auditory 

 bull^ are intermediate in size between those of R. macmillani and 

 JR. T. tatkonensis (see part III, tables II (e) and II (h) ). 



Bemarks : — At first I was inclined to refer this form to Blyth's 

 Mi^s rohustulus. The type of the latter species has, however, been 

 carefully described by Kloss recently {Bee. Indian Mus., xiii., 1917, 

 p. 6) ; the measurements of the skull given by Kloss appear to me to 

 indicate that rohustulus really belongs to an entirely distinct group. 



12. Battus rattus tikos, subsp. n. 



1915. Mpimys rufescens, variety with white underparts, Wrough- 

 ton. Report No. 17, /. Bombay Nat. Hist. Soc, vol. xxiii., p. 715. 



Tyjje:— A male (B. M. No. 14.12.8.168; Original No. 4934) 

 collected on 13 March 1914 at Tenasserim Town by Mr. G. C. 

 Shortridge; presented to the British Museum by the Bombay 

 Natural History Society. 



Material examined: — Tenasserim Town 6 (3 d" , 3 $ ) ; Tenasserim 

 Village 3 (1 d , 2 $ ) ; Banlaw 1 ( $ ) ; Tagoot 20 (13 d , 7 $ ) ; 

 Thaget 5 (3 c^ , 2 $); Maliwun 4 (1 s, 3 $); Bankachon 12 

 (6 c? , 6 $ ); Victoria Point 41 (22 j , 19 $ ) ; Victoria Island 4 

 (2 cf , 25). Total 96 (51 d > 45 $ ) ; of these 59 may be regarded 

 as fully adult. 



Description : — This is geographically the most remote of the races 

 of B. rattus described in this paper. It is apparently most closely 

 allied to B. r. khyensis, from which it is distinguished principally 

 by its dingier coloration, shorter tail and more variable mammary 

 formula. As regards the shortness of the tail, it is most nearly 

 approached by the typical specimens of khyensis from the Chin 

 Hills ; but as regards the variability in the mammse, those from 

 the North Shan States seem to foreshadow the present form. 



