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



Bescriijtion. — This is a dark coloured, moderately long tailed 

 member of the Bathis group. 



The fur is short, thin and rather harsh — being intermixed, in 

 adults, with numerous soft, greyish-white bristles. The dorsal 

 colour is black, finely grizzled with greyish white and tawny ; the 

 blackness is chiefly due to the presence of numerous long black 

 hairs, which are especially numerous along the mid-dorsal line and 

 particularly conspicuous over the rump. The bellies are pure white, 

 the ventral hairs being white to their bases. The line of demarcation 

 along the flanks is sharply defined. The feet are light brown, 

 darkened above by a more or less evident dusky marking. The 

 tail averages about 130° j^ of the head and body length, and is dusky 

 throughout — above and below. The female has 12 mammse. The 

 following are the dimensions of the more important specimens ; — 



5847, cJ, 27 July 1914 156-200-33.5- 20=100-128-21.5-12.8 

 .226 5972, d, 8 Aug. „ 158-205-34- 22=100-130-21.5-13.9 

 5975, c?, 8 „ „ 150-211-35- 21-5=100-141-23.3-14.3 

 .227 5973,$, 8 „ „ 169-222-32.25-22=100-131-19.1-13 



5974, $ , 8 „ „ 154-187-32.5-21.75=100-121-21.1-14.1 

 Average of 7;— 150-195-32.9-21.5 = 100-130-22-14.3 



The skull is small, the condylo-basal length averaging 37.2 in 

 four specially examined. It differs little in form from that of the 

 Indian races of i?. rattus. Among Burmese races it is distin- 

 guished by its small bullae (see dimensions in tables II {e) and II 

 ((/), part III ) and relatively great cranial width ; the latter 

 dimension exceeds the occipital breadth by an amount equal to 3 

 ^ of the condylo-basal length. The interpterygoid fossa is wide 

 and the palate develops no median posterior projection. The 

 temporal ridges run at a relatively high level, and in old age tend 

 to obliterate the supratemporal articulation of each parietal with 

 the supraoccipital. 



RemarTxS : — This form is so sharply differentiated from all the 

 others described in this paper that it seems to demand recognition 

 as a full species. I have great pleasure in naming it in honour of 

 the late Captain S. A. Macmillan w^ho, in conjunction with Mr. 

 Shortridge, did so much good work for the Mammal Survey. In 

 general appearance li. onacmillani is strikingly similar to B. mento- 

 8US, Thos., described (/. Bombay Nat. Hist. Soc, xxiv, 

 p 643) from the same localitj^ ; the resemblance of course is 

 quite superficial, for onentosus belongs to a widely different group 

 and has a bi-colored tail, 8 mammse only, and a very peculiar 

 skull. 



Certain specimens obtained by the Sur^^ey at Tamanthe and one 

 (No. 5310) from Kin, Lower Chindwin, make a more or less close 

 approach in external and cranial characters to B. macmillani ; and 

 for the moment I propose to leave them with this form. 



