SCIENTIFIC RESULTS FROM THE MAMMAL SURVEY. 0!) 



Tlie followinc: are 



averages 



(absolute and percentages of the 



of both sexes 



?lage. 



head and body length) of specimens in adult pe 

 and all from Pashok : — 



(1) Average of 31 (Head and body ranging between 122 and 

 161) with slaty bases to the ventral hairs = 



143— 174— 32-1— 21 = 100— 122— 22-5— 14-7. 



(2) Averaee of 81 (Head and body ranging between 120 and 

 171) comprising intermediate specimens as well as those wdth pure 

 irhite ventral hairs = 



147_181_32-1— 21-3 = 100— 124— 21-8- 14-5. 



(3) Average of 50 lO-maramsed females (ventral coloration of 

 both types) = 144— 177— 31-5- 20-9 = 100— 123— 21-9- 14-5. 



(4) Average of 40 white-bellied females (a few not included in 

 the total of average 3, because their mammse could not be counted 

 on the skins) = 145— 179— 31-4— 21 = 100— 123— 21-6- 14-5. 



In no female did the length of the head and body exceed 

 161 mm. Larger individuals were not only always males, but were 

 all of the pure white-bellied type ; I suspect that some of these 

 really belong to B. r. sikJdmensis (described below), for without 

 examining the skulls * it is sometimes difficult to discriminate 

 between the males of that sub-species and those of the white-bellied 

 phase of the present form. 



The following table shows the decreasing values of the average 

 relative lengths of the tail, hind-feet and ears in B. r. tistce at suc- 

 cessive stages of growth ; for systematic purposes it is instructive 

 to compare it with the similar table given latter for the asso- 

 ciated jB. r. siJcJcimensis : — 



Pashok. 



R . ?: tista;. 



Head and body 

 mm. 



Sex. 



No. of 

 specimens 



Average length in percentages 



of Head and Body, 

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



14 

 12 

 21 

 16 

 18 

 15 

 15 



X 



2 

 10 



100—127- 

 100—129- 

 100—120- 

 100—125- 

 100—125- 

 100—129- 

 100—119- 

 100—111- 

 100—118- 

 100—121- 



-26-7 - 

 -24-2 - 

 -23-4 - 

 -22-4 - 

 -22-8 - 

 21-3 - 

 -20-9 - 

 -20 - 

 -20-25- 

 -20-25- 



-17-1 



-15-5 



-15-1 



-14-9 



-14-4 



-14-1 



-14 



-13-1 



-14 



-14-8t 



* It was not possible to clean all the many skulls collected and often the 

 search for the skull of some particularly fine skin revealed the annoyingf fact that 

 that particclar skull had been smashed by the trap. 



T As noticed above these larpre rats are probably in part referable to 

 U. r. sikkime7isis. 



