MAMMALIA. 
45 
MUS GRACILIPES. 
Plate XI. 
Mus gracilipes, Waterh ., Proceedings of the Zoological Society of London, for February 1837, p. 19. 
M. supra Jiavo-lavatus ; pilis pone aurem utramque , labiis, corporeque subtiis, albis ; 
peclibus parvulis , gracilibus, carneis, supra et ad calcem pilis albis tectis ; caudd 
gracili, pilis albis instructd, quoad longitudinem corpus fere cequante ; auribus 
mediocribus ; vellere mediocri et molli, pilis omnibus ad basin plumbeis. 
Description. — General colour very pale yellowish brown, a tint produced by the 
admixture of black and pale fawn colour ; the hairs of the ordinary fur being 
of the latter tint near the apex, and dusky at the apex, whilst the longer 
hairs are black. The feet, tail, under parts of the body and the sides of the 
muzzle, are pure white. All the hairs of the body, (which are soft, and of 
moderate length), are deep gray at the base. The ears are of moderate 
size, well clothed with hairs, of which those on the inner side are yellowish, 
and those on the outer, are brown on the anterior part, and white on the 
posterior. A small tuft of white hairs springs from the neck immediately 
behind the ears ; this tuft is hidden when the ears are folded back. The tail 
is slender and short, (being not quite equal to the body in length) of a pale 
flesh-colour, and sparingly furnished with minute white hairs. The feet are 
very small and slender, and the naked parts are of a pale flesh-colour. The 
sole of the foot is covered with hairs ; the toes beneath, and the tubercles 
(which are as in Mus Musculus ), however, are naked. The hairs of the 
moustaches are of moderate length, and of a blackish colour, some of them, 
however, are grayish white. 
In. Lines. 
Length from nose to root of tail . .2 10 
of tail . . . . .17 
from nose to eye . . 0 4^ 
Habitat, Bahia Blanca, ( September .) 
This species slightly exceeds the harvest mouse ( Mus messorius ) in size, its 
ears are considerably larger in proportion, and the tail is shorter. Compared 
with the common mouse ( Mus Musculus ) it is smaller, the tail is more slender, 
and shorter, and the feet are likewise more slender and proportionately much 
smaller ; the ears are more distinctly clothed with hairs. 
Length from nose to ear 
of tarsus (claws included) 
of ear 
In. Lines. 
0 8i 
o e$ 
o 44 
