79 
NEW AND OTHER WHITE-TOOTHED RATS FROM SIAM. 
By C. Bopen KLoss, F.z.s. 
Mr. K.G. Gairdner, C.M.z.3., has sent me three examples of this 
interesting Indo-Chinese group of rats, some of which are very little 
known and are difficult to determine in the absence of direct com- 
parison with topotypes. 
The first of the specimens is a member of the species Rattus 
berdmorei (Blyth) and is easily separated from the other two on account 
of its darker, greyer upper-parts, more projecting upper incisors, which 
are practically without any backward curve, and very large bullae. It 
is apparently only the third known specimen of 
1. Rattus berdmorei mullulus (Thomas). 
Mus berdmore’, Thomas (partim) Ann. Mus. Civ. Genova (2a) x (xxx), 
p. 938 (1892). [Thagata, Muleyit Range, Tenasserim]}. 
Epimys berdmorei, Kloss P. Z. 8. 1916, p. 59 [Measurements of the 
above : type of R. b. mullulus]. 
Epimys berdmorei mullulus, Thomas, Journ. Bombay N.S, xxiv, p- 
413, 14 (1916). 
12 vix ad. from Me Maw near Lakon, North Siam [No. 2507/ 
CBK]. Collected by Mr. K. G. Gairdner on 3 Oct. 1915. Orig. No. 224. 
Fur consisting of shorter soft hair and longer slender, pliable, 
flattened spines. 
Colour above clove brown with a frosted appearance caused by 
the pale buffy tips of the under fur and by the exposure of the pale 
basal portion of the spines; a distinct sheen on the back : sides of head, 
neck and body and the limbs, grizzled brownish grey. Fore digits 
practically naked, metapodials brownish white: hind feet white from 
the claws nearly to the ankles. Under-parts entirely white, this colour 
separated from the hind-feet by an indefinite narrow band of brownish 
grey. ‘Tail apparently black throughout and clad with dark hairs.* 
Mr. Gairdner notes, “Grey rat, tail shorter than body, tubercles 
on feet very pronounced: five prominent plantar pads and one small ; 
on the fore-feet the lower plantar pads are larger than the thumbs. Ear 
rounded and large. Lower incisors long, slender and white.” 
* See also description of Rattus berdmorei maguus (Kloss, P.Z.S 19:6 
se pas fig. 1) from S. E. Siam, which is very similar in colour and type of 
skull. 
* VOL. III; NO: 1, 1918. 
