Descriptions of East Asiatic Mammals 289 
four forms, with rather scattered distribution: R. canus from 
Tuangku Island, off Sumatra, R. c. malaisia from Selangor, 
Malay Peninsula, R. c. sodyi from west Java, and R. legatus 
from the Luchu Islands. 
R. canus malaisia, with the somewhat enlarged molars char- 
acteristic of the group, has the color of the upperparts mouse- 
gray to brownish gray, the underparts creamy white, the tail 
black at the base, the terminal half or two-thirds white. The 
number of nipples is 4. Externally these Rats resemble those of 
the bower si and berdmorei groups. The length of the head and 
body in malaisia is from 6% to 7% inches, tail 8% t( > 9 inches, 
hind foot 1% to 1% inches. 
h. Berdmore's Rats, Rattus berdmorei group, were origi- 
nally recorded from Mergui (near Tenasserim), upper Malay 
Peninsula. The fur, coarse or almost bristly, is grizzled gray 
without mixture of rufous; below and on the feet it is pure 
white. The tail, slightly shorter than head and body, is rather 
more densely haired than is usual in Rattus. The upper incisors 
are whitish yellow, not orange. The length of the hind foot is 
1% inches. Another race, R. b. magnus, is recorded from south- 
eastern Siam, and a third form, R. manipulus, from upper 
Burma. The first of these has the length of the head and body 
6 1 / 4 inches, tail 6 inches, hind foot 1 % inches ; the same dimen- 
sions in manipulus are 7%, 7%, 1% inches, the terminal two- 
fifths of the tail being white. 
i. The Confucian Rats, Rattus confuciomus, are represented 
by at least four races in various parts of China. The fur, which 
may be slightly spinous in summer, is dark slate-gray above, 
whitish or yellowish white beneath. The tail is dark above, white 
beneath, usually white-tipped, and considerably longer than the 
head and body. The length of the head and body varies from 5 
to 6 inches, tail 6% to 7% inches, hind foot 1% to 1% inches. 
In the race R. c. chihliensis from Jehol the tail is less elongate 
proportionately. North of the Yangtse River the race R. c. sacer 
