NEW AND OTHER WHITE-TOOTHED RATS FROM SIAM. 8t 
Pelage composed of soft woolly under fur and longer stiffer hairs, 
or spines not visibly flattened. 
Colour above, glossy Natal brown Geiuoled by the pale buffy tips 
of the under fur, paler on the sides, fore-limbs and thighs; muzzle, 
cheeks, crown, sides of neck and the lower leg brighter, near Verona 
brown in colour; base of hairs neutral grey, of spines whitish. 
Below white throughout except the ankle, the white clearly margined 
from the brown of the sides, etc. Fore-digits whitish, metapodials 
grizzled brown; hind feet white, slightly darkened down the middle, 
ankles brown. ‘Tail apparently dark throughout except at the base 
beneath. Ears large, 23 mm. broad. 
Skull like that of ferreocanus, the ante-orbital plate with the 
lower edge vertical; but the nasals not extending so far behind the 
premaxillaries, posterior edge of frontals more curved, bullae larger, 
palatal foramina slightly smaller, falling short of the molars by nearly 
2 mm., and the tooth-rows markedly diverging posteriorly. 
Rattus mackenziae feae (Thomas ),” though from an adjacent 
locality (Thagata, Muleyit Range, Tenasserim ) and of nearly the same 
size, cannot be the same as this animal, for its colour is indicated as 
being ‘‘nearly deep purplish grey but browner,” while this shows no 
tone of grey at all but is of a warm brown colour. Mr. Gairdner 
refers to it in his notes as the ‘“‘ chestnut-cheeked rat.” 
( For measurements see table postea). 
The third specimen, though from the same place and of the 
general colour as the last, is smaller, yet the teeth indicate that it is of 
about the same age. I know of no form to which it seems allied and 
therefore describe it as 
3. Rattus kennethi, sp. nov. 
Type. Adult female from Sikawtur, 40 miles N. W. of Raheng, 
W. Siam, 1500 ft. [No. 2636/CBK.]. Collected by Mr. Kenneth 
G. Gairdner on 14 March 1917. Orig. No. 403. 
Like R. b. lactiventer but smaller and without the warmer 
colouring on the sides, etc.; feet of more clearly defined dark and white 
pattern, tail pale below with a distinct pale tip. Skull more rounded 
and relatively broader, palatal foramina reaching the line of the molars, 
toothrows diverging rather less posteriorly. 
* Journ. Bombay Nat. Hist. Soc. XXIV, p. 412 (1916). 
VOL. III, NO. II, 1918. 
