SCIENTIFIC RESULTS FROM THE MAMMAL SURVEY. 1061 
1920. Rattus vicerex (in part), Wroughton. J. B. N. H. S. xxvi., 
p. 798 ; Hinton, ib., p. 918. 
Closely allied to R. vicerex, Bonhote, but difiering in the following 
characters : — 
Tail relatively longer, its length averaging 133 per cent, of the head 
and body measurement. 
Coat harsher and looser, the whitish “ spines ” and long black 
hairs being more numerous. General colour, above and below, darker 
and greyer than in typical vicerex from Simla, the underparts much 
less strikingly contrasted with the flanks. The darkening of the beUy 
is due to the fact that the ventral hairs have slatey bases instead of 
being pure white throughout. Tips of ventral hairs usually silvery 
but sometimes yellowish, the underparts then having a more or less 
evident rusty sufiusion. Tail, in the majority of specimens, dusky 
above and below, lacking the marked bicoloration characteristic of, 
and constant in true vicerex. In a few Nepalese specimens the tail 
shows faint traces of bicoloration ; and in two or three it is well-marked 
Mammae 3-3=12 (as in vicerex*.) 
Skull with relatively still broader nasals, peculiarly expanded 
interorbital region, smaller and still less inflated bullae, and slightly 
longer tooth-rows. 
For measurements see Tables at pp. 1065-1066. 
Leclo-Type. — B. M. No. 43. 1. 12. 66. Collected in Nepal and 
presented to the British Museum by B. H. Hodgson, Esq. 
Habitat . — Nepal and Sikkim. 
Material examined : — In addition to the two co-types in the Hodgson collec- 
tion the followingcollected in Nepal for the Mammal Survey are now before me : — 
Katmandu, 1 ; Nagarkot, J 7, 9 7; Ferping, $ 3, Hathiban, d' 2, 2 1 ; 
Thankot, S' 3; Changoo, c? 2; Sipari, $ 1 and Ramchi (11,000'), 21- Total 
from Nepal 30 adults. 
From Sikkim I have 13 specimens, all collected by the Mammal Survey, ob- 
tained at the locahties Chimtang (.5,350'). Ghoom (7.400'), and Batasia (6,000'). 
The following are the external measurements of the more important 
specimens : — 
No. 
1 
Head and 
Body. 
Tail. 
Hindfoot. 
Ear. 
251 
2 Ferping 
170 
225 
33 
26 
191 
^ Hathiban 
160 
210 
35 
27 
219 
$ „ .... 
155 
212 
35 
26 
281 
(S Thankot 
156 
205 
34 
25 
367 
2 Nagarkot 
164 
208 
34 
25 
Average of 27 adults 
Average per cent, of head 
157 
193 
33.2 
24.8 
and body measurement . . 
100 
133 
21.2 
15.8 
* Wroughton “ Summary ” (J. B. N. H. S. xxvi., p. 798) gives the mammse as 
10, but I find 12 to be present normally in vicerex. 
