294 
ARVICOLA OCCIDENTALIS . P bale. 
Western Arvicola. 
A. Pilis mollissimis et tenuissimis, extremitatibus superionbus ruhs 
sine ulla nigri admistione, auribus sub-pilis occultis. Cauda, sub-com- 
prossa, supra et subtus concolore rufa. 
CHARACTERS. 
Hair very soft and fine ; ears concealed under the fur, hairy only on the out- 
side. Tail slightly compressed, reddish coloured above and beneath. 
SYNONYMES. 
Arvicola occidentalis — Peale, Zool. Expl. Exped., 1 . c. 4o. 
u <4 Le Conte, Proc. Acad. Nat. Sciences, Oct. 25, 1853, 
p. 408. 
DESCRIPTION. 
Ears round, entirely concealed under the fur, liairy only on the outside, 
antitragus rather short ; head blunt ; feet covered with short, lustrous 
hair ; thumb tubercle with a compressed, sharp nail. Tail slightly com- 
pressed. 
COLOUR. 
Hair dark plumbeous, above tipped with bright rufous without any 
admixture of black : beneath grey, hair on the feet rufous. Tail rufous, 
both above and below. Incisors pale yellow. 
DIMENSIONS. 
Inches. 
Length 
of head and body, 
4-3- 
^1 0 
It 
tail, - 
2 To 
ti 
hair beyond tail vertebra, 
2 
1 o 
It 
hind foot, 
5 
1 0 
It 
fore “ (from wrist to end of toes), 
5 
“ 1 0 
It 
head, - 
1 2 
J-l 0 
Obtained 
at Puget’s Sound, Oregon, by the United 
States Exploring 
Expedition. 
