244 Mr. O. Thomas on 
pointed, the accessory cusp is reduced, and the two tips are 
comparatively close together. 
Range of genus. K. Indian Archipelago, instead of Hima- 
layas, China, and Japan. 
Genotype. Crossogale pheura( Chimarrogale pheura, Thos.). 
Crossogale sumatrana, sp. n. 
Coloured like C. pheura of Borneo, but size greater. 
Fur, as usual in water-shrews, soft and velvety, hairs of 
back about 7 mm. in length. Colour above uniform sooty 
grey, the hair-tips black; a few longer white-tipped piles on 
the rump. Under surface dull brownish. Hands whitish, 
the swimming-fringes dark brown. Feet mostly whitish, 
but their outer border and the swimming-fringe brown. Tail 
uniformly dark brown throughout. 
Skull shaped about as in C. pheura, but much larger and 
heavier. 
Anterior incisors larger and stronger than in pheura, the 
characteristic internal terminal cusp strongly developed, and 
the main outer points well separated. 
Alab, Sumatra. Type from Pager Alam, Padang High- 
lands. 
Type. Old specimen (probably male). B.M. no. 21.2.9. 1. 
Temporary number 169. Collected 28th November, 1918. 
Presented by the Buitenzorg Museum. One specimen only. 
The characters of this shrew, agreeing closely as they do 
with those of the Bornean form, and standing out in marked 
contrast to those of the four known Continental species, 
appear to render it advisable to separate generically from 
each other the water-shrews of the two regions. 
Of the Muridw, the first three belong to the group charac- 
terized by a whitish end to the tail. 
Rattus dominator, sp. n. 
Size decidedly larger than in R. wanthurus and celebensis. 
Character of fur as in the latter, the body-fur not trespassing 
on to the tail, comparatively short, and not intermixed with 
long piles. General colour of upper surface uniform greyish 
brown ; under surface sharply defined white, the hairs white 
to the roots. Ears, hands, and feet dark brown, the digits 
lighter. Tail very thinly haired, almost naked, the proximal 
two-fifths blackish, the remainder yellowish white. Mamme 
not certainly known, probably 1—2=6. 
Skull much larger than that of xanthurus and celebensis. 
Nasals very long, narrowed nearly to a point posteriorly. 
