SCIENTIFIC RESULTS FROM THE MAMMAL SURVEY. 395 



Jalpaiguri, Bengal. Total 53 (26 c? > 27 $); all collected for 

 the Mammal Survey by Messrs. C. A. Crump and N. A. Baptista. 

 Specimens presented to the British Museum have been mostly 

 registered under the serial number 15.9.1. 



BescriiAion : — This is a distinctly larger form than B. r. tistce its 

 companion at Pashok ; the head and body averages 154 instead of 

 147 ; the ear 22.4 instead of 21.3 ; and the condylo-basal length 

 of the skull 41.4 instead of 37.8. The tail is relatively longer, 

 its average length being equal to 131 per cent, instead of 124 per 

 cent, of the head and body measurement. 



The fur is soft and thick on the back and flanks and does not show 

 any tendency to become spinj^ ; on the underparts it is long but with 

 a peculiar, rather harsh appearance. The dorsal colour in the 

 typical series is a dark olive-brown, quite like that of R. r. tistce 

 from the same locality. The belly is pure white or cream coloured; 

 the ventral hairs being white or cream to their bases. The lateral 

 lines of demarcation are sharp and regular. The hands and feet 

 are greyish or yellowish white above, with or without more or less 

 obscure dusky markings. The tail is unicoloured and dusky. 

 The mammary formula of the females is apparently constantly 

 3—3=12. 



The following are the dimensions of the more important speci- 

 mens from Pashok : — 



236 c? , 27 June 1915 146—190—33—23 



„ 160—208—31—22 



^, 170— 34—25 



„ 172—222—34—24 



,, 174_ 34—24 



„ 170—215—32—23 



„ 165—209—31—23 



, 174_217— 32— 24 (Type.) 

 Average of 24 adults with head and body ranging between 128 

 and 174 ;— 



154—201—32.2—22.4 = 100—131—20.9—14.6. 



The variation in the proportions with growth is as follows : — 



Head and body, 

 mm. 



No. of 

 specimens. 



Average % of head and body length 

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



128 to 139 

 140 to 149 

 150 to 159 

 160 to 169 

 170 to 174 



100—142—24 —16.1 



100—134—22.1—15 



100—132—20.7—14.7 



100—130—19.2—14 



100—127—19.3—14 



10 



