SVIEI^'TIFIC RESULTS FROM TJilJ MAMMAL SURVEY 





relative!}' longer, averaging in tlie adnlts 131 per cent, of the head 

 and body measurement instead of about 123 per cent. Mammarj- 

 formula constantly 2-3=10. 



Taken as a whole the series shows brighter backs than those of 

 typical B. r. fistce from Pashok, the general dorsal colour being a 

 rufous tint near " Brussells brown"; many of the specimens are. 

 however, as dark in hue as any from Pashok. As in 11. r. tistce the 

 ventral coloration is of two types ; 62 (32 J , 30 5 ) have pure white 

 bellies, the ventral hairs being white to their bases; in 18 (15 j , 

 35) the bellies are white also, but slaty bases are developed by 

 many of the hairs on the chest and throat, forming chest spots or 

 stripes of large size ; in 6 (2 ^ , 4 $ ) pure white and slaty-based 

 hairs are equal in number and distribution; lastly in 38 (17,5'. 

 21 2 ) practically all the hairs have slaty bases and light tips, and 

 in these specimens a median stripe-like suffusion of buif is some- 

 times developed. The preponderance of pure-white bellied indivi- 

 duals is therefore as well marked in this subspecies as in the typical 

 series of i?. r. tistce from Pashok ; and it may be suggested that the 

 two types of ventral coloration in both forms are "mutations'" 

 obeying Mendel's law in inheritance. 



The following are the dimensions of the specimens whose skulls 

 were specially investigated : — 



Ventral hairs : — 



tions correlated with growth or larger size and it may be compared 

 with that given at p. 69 above : — 



Head and Body, 

 mm. 



Average 96 of head & body form- 

 ed by H. & B. Tail, Hind-foot, Ear. 



10 



