chief they perpetrate. "They burrow in the gardens,
and destroy the sweet potatoes; they make their nests in the roofs
by day, and visit our houses and larders by night. They will eat into
teak drawers, boxes, and book-cases, and can go up and down anything
but glass. In the province of Tonghoo they sometimes appear in
immense numbers before harvest, and devour the paddy like locusts.
In both 1857 and 1858 the Karens on the mountains west of the city
lost all their crops from this pest." They seem to migrate in swarms,
and cross rivers by swimming. Mr. Cross captured one out of a pair
he observed swimming the Tenasserim river at a place where it is more
than a quarter of a mile wide. _M. Berdmorei_ is the same as this
species.

* * * * *

The following three are Burmese rats collected by Dr. Anderson during
the Yunnan Expedition, and are new species named by him:--

NO. 336. MUS SLADENI.
_Sladen's Rat_.

HABITAT.--Kakhyen hills; Ponsee at 3500 feet.

DESCRIPTION.--Head rather elongated; snout somewhat elongate;
muzzle rather deep; ears large and rounded, sparsely clad with short
hairs; feet well developed, hinder ones rather strong; claws
moderately long and sharp; the feet pads markedly developed,
indicating an arboreal habit of life; tail slightly exceeding length
of head and body, coarsely ringed, there being three rings to each
one-tenth of an inch; the hairs sparse and brown; general colour of
upper surface reddish-brown, more rufous than brownish, palest on
the head, many hairs with broad yellow tips; cheeks greyish-rufous;
chin, throat, and chest whitish, also the remaining under-parts, but
with a tinge of yellowish; ears and tail pale brownish. (Abridged
from Anderson's 'Anat. and Zool. Res.' p. 305.)

SIZE.--Head and body of one, about 6.30 inches; tail, 7.20 inches.

Dr. Anderson says this species is closely allied to Hodgson's _Mus
nitidus_, but its skull is less elongated, with a shorter facial
portion, with very much shorter nasals, and with a more abruptly
defined frontal contraction than either in _M. nitidus_ or _M.
rufescens_ so called. He adds that this appears to be both a tree
and a house rat.

NO. 337. MUS RUBRICOSA.
_The Small Red Rat of the Kakhyen Hills_.

HABITAT.--Kakhyen hills and the Burma-Chinese frontier at Ponsee,
and in the houses of the Shan Chinese at Hotha.

DESCRIPTION.--"Snout moderately pointed and long; ears small, and
somewhat poin