TH Is 
JOURNAL 
OF THE 
Natural History Society of Siam 
December 1915. Vow No. 4. 
ON TWO NEW RATS FROM THE INNER 
GULF OF SIAM. 
PF 
By C. Bopen Kuoss, F.Z.S. 
During a short visit to Koh Si Chang and Koh Phai, | obtained 
a number of specimens of Hpimus rattus, which appears to be the only 
species of terrestrial mammal inhabiting the two islands other than the 
squirrels that I have already dealt with in the Journal of this Society. 
These rats differ sufficiently trom each other and from any 
named form of H. rattus from South-Hast Asia to make it necessary 
to describe them. From Flower’s notes on the common rats of Bang- 
kok (P. Z. S. 1900, p. 361) it would seem that the animals of that 
locality are in part of somewhat similar type. 
Epimus rattus portus, subsp. nov. 
Type. Aged male (skin and skull) No. 1941/C B. K. Collect- 
ed on Koh Si Chang, Inner Gulf of Siam, 27th January, 1915. 
Characters. A long-tailed race of HL. rattus of notably yellow 
and bright colouration. 
Colour. Above light ochraceous-tawny becoming paler on 
the sides and limbs and striped (coarsely grizzled) on the dorsal 
region by the dark tips of flexible pale-based spines and longer 
dark piles, the latter being most conspicuous on the rump. Base of 
fur grey. 
