[NO. 345. MUS CONCOLOR.]
The Common Thatch Rat of Pegu.

HABITAT.—Upper and Lower Burmah, Malayan peninsula.

DESCRIPTION.—I have been unable to trace any accurate description of this rat, which Blyth says "conducts from the long-tailed arboreal rats to the ordinary house mice." In his 'Catalogue of the Mammals of Burmah,' published in the 'Jour. Asiatic Soc. Beng.' for 1875, he remarks that "it requires to be critically examined in the fresh state." In the 'J. A. S. B.,' vol. xxviii. p. 295, he describes a young one as dark greyish mouse colour; but this is not reliable, as the young rats and mice change colour as they attain full growth.[23]

23 Since writing the above, Dr. Anderson has kindly allowed me to examine the specimens of Mus concolor in the museum, and in the adult state they are considerably more rufescent. In one specimen, allowing for the effects of the spirit, the fur was a bright rufescent brown; but, whatever be the tint of the prevailing colour, it pervades the whole body, being but slightly paler on the under-parts. Size, about 4 inches; tail, about 4½ inches.—R. A. S.

[NO. 346. MUS PALMARUM.]
The Nicobar Tree Rat.

HABITAT.—Nicobar Islands.

[NO. 347. MUS CEYLONUS.]

HABITAT.—Ceylon.

DESCRIPTION.—Fur soft, lead colour; hair of upper parts tipped with dark fawn and black; ears large, naked; whiskers long, black; tail longer than the head and body, scaly.

SIZE.—Head and body, 4¾ inches; tail, 6 inches.