SCIENTIFIC RESULTS FROM TUB MAMMAL SURVEY. 71 



. Batasia, Tonglu (6,000'). 



3 (1 c^" , 2 $ ) collected by Mr. Crump (2 in British Museum 

 Nos. 15, 9, 1, 150-151). Dimensions: — 



•150 6394 cJ, 25 Feb. 1915, ] 63— 188— 35— 22, Weight 5 ozs. 

 6395$, „ „ ., 155—183—35—21 „ 5 „ 



•151 6411 $,27 „ „ 151—206—31—21 „ 4 „ 



Each female has 10 mammss. No. 6411 is quite like those from 

 Pashok, but the other two have much brighter yellowis-h-brown 

 backs, lined with black. In the two registered specimens, the ven- 

 tral fur is long and soft; certain of the hairs are buft-tipped and form 

 an indistinct median thoracic stripe and pectoral collar; most of 

 these buff-tipped hairs have deep slaty bases, but the dark tint is 

 almost completely hidden by the long light tips. Elsewhere all 

 the ventral hairs, save the usual bright buff ones around the geni- 

 talia, are white throughout. In No. 6395, the majority of the 

 ventral hairs have a veiy pale greyish basal tinge. The feet are 

 ashy grey, with a slight tinge of j^ellow in the male. The 

 skulls are imperfect but agree apparently with those from 

 Pashok. 



RONGLI (2,700'). 



7 (3 J 4 $ ) collected by Mr. Crump ; of these 4 are now in 

 the British Museum and their dimensions are : — 



B. M. 15, 9, 1. 



■137 5847 c?, 24 Nov. 1914. 158— 183— 34— 21, Weight 4^ ozs. 



•139 5825 $,22 „ ,. 156—185—33—21 ,, 4^ „ 



•1415849 $,25 „ „ 153—170—31—21 „ 4| „ 



•142 5850$,,, „ „ '148—167—32—21 „ 4 „ 



Nos. '139 and "141 have each 10 mamma3. 



This series is interesting as showing that sometimes the differ- 

 ences in ventral coloration, ah'eady alluded to, are apparently co- 

 related with slight differences in the dorsal colour. Ihus Nos. 

 5847 and 5825 have bellies of a pronounced Apodemus type, i.e., 

 the ventral hairs have deep slaty bases and a heavy and rather 

 generally distributed sufi'usion of buff; in these two the backs also 

 are darker than in the following, Nos. 5849 and 585^^ have 

 silvery bellies with the ventral hair bases of a distinctly lighter 

 grey than in the first mentioned specimens ; their backs have more 

 of the yellowish-brown tints seen in some of the specimens from 

 Gangtok and Batasia. The feet, moreover, are inclined to be 

 lighter in the lighter bellied type. Similar difierences are shown 

 by the three unregistered specimens from this locality. Ilie skulls 

 of -137 and "141 were measured (Table 1) and apparently agree 

 with those from Pashok. 



