ellowish-grey; ears large,
nearly naked; incisors deep yellow; tail brown, covered with short
hairs.

SIZE.--About 7-3/4 inches; tail, 6-1/4 inches.--'Mammiferes,' p.
289.

NO. 383. MUS GRISEIPECTUS.
_The Grey-breasted Rat_.

HABITAT.--Moupin; Thibet.

DESCRIPTION.--Brown above; the under-parts of a clear grey.

SIZE.--About the same as the last, but with a somewhat shorter
tail.--'Mammiferes,' p. 290.

NO. 384. MUS CONFUCIANUS.

HABITAT.--Moupin; Thibet.

DESCRIPTION.--Fawn brown above, pure white below; lower part of
cheek white; on the back the fur is interspersed with longer hairs
of a blackish tint; feet pale.

SIZE.--Head and body, about 4 inches.--'Mammiferes,' p. 286.

NO. 385. MUS CHEVRIERI.

HABITAT.--Moupin; Thibet.

DESCRIPTION.--General colour tawny brown, grizzled with dark brown;
lower parts of a clear grey, almost white; ears short; feet small;
tail covered with short hair.

SIZE.--About 4-3/4 inches; tail about 3-1/2 inches.--'Mammiferes,'
p. 288.

NO. 386. MUS PYGMAEUS.
_The Pigmy Mouse_.

HABITAT.--Moupin; Thibet.

DESCRIPTION.--Distinguished by its very short ears and the square
form of its head; deep brown above; greyish-yellow beneath; tail
shorter than in the common mouse.

SIZE.--About 2-3/4 inches; tail, about 2 inches.--'Mammiferes,' p.
291.

ARVICOLINAE.

In this sub-family the molars are generally semi-rooted or rootless.
The _Arvicolinae_ or Voles consist of the American Musquash (_Fiber
zibethicus_), a very beaver-like water rat of large size; the
Lemmings (_Myodes_), of which there are several species which are
celebrated for their vast migrations; and the true Vole (_Arvicola_),
which is the only genus found in India, and then only in the colder
climate of the Himalayas. There are several species in Europe, of
which three are found in England. According to Professor Dallas, the
true Voles number about fifty species, arranged by various writers
under a considerable number of sub-genera. In India we have only
eight known species, and two more from the adjacent country of
Thibet.

[Illustration: Dentition of _Arvicola_.]

The European forms of _Arvicolae_ have been divided by Blasius into
four sub-genera of two divisions--the first division having rooted
molars in the adult animal--containing one sub-genus only,
_Hypudaeus_ of Illiger; the second division consists of three
sub-genera with rootless molars, viz. _Paludicola_, _Agricola_, and
_Arvico