Descriptions of East Asiatic Mammals 263 
belonging to this group have the length of the head and body 
about 4 inches, often less, tail 1 to 1*4 inches, hind foot 
% to % inch. 
The C. rufocanus group includes rufocanus proper, extending 
from Europe to Kamchatka, C. r. kolymensis from Kolyma 
River region, C. r. shanseius from Shansi, China, C. r. regulus 
from Korea, C. r. smithii from Japan, C. arsenjevi from Vladi- 
vostok, C. r. latastei from Kamchatka, C. r. kurilensis from 
the Kurile Islands, ussuriensis from Ussuri. 
These are robust Red-backed Mice with the length of the 
head and body 4 to 5 inches, tail 1 to 1% inches, hind foot from 
% to % inch (without the claws). 
Aschizomys, with typical species A. lemminus, from Plover 
Bay, on the Bering Strait, Siberia, is closely related to Cleth- 
rionomys, but the teeth grow from persistent pulps as in 
Micro his. Though treated as intermediate between those two 
genera, it may also be related to Eothenomys of southern Asia 
or to Alticola. The dense silky fur is colored a fine grizzle of 
sepia and yellowish brown, the underparts straw-yellow; in 
front of each ear is a tuft of white hairs. The tail has a distinct 
hair pencil. The hands and feet are straw-yellow (these colors 
from specimens in alcohol). The length of head and body 
reaches 3% inches, tail % inch, hind foot % inch. 
Neoaschizomys, a northeast Asiatic species, also appearing 
related to Clethrionomys, has been distinguished. The type, 
N. sikotanensis, from one of the southern Kurile Islands, has 
dense, soft, reddish orange fur on the back, gradually changing 
to light buff underparts. The hands and feet are dark gray, 
their soles hairy behind the tubercles. The length of the head 
and body is 5 inches, tail 2% inches, hind foot % inch. 
The Dawn Meadow Mice, Eothenomys, are a genus of 
Meadow Mice intermediate in character between the Red-backed 
Mice and the True Meadow Mice. The colors are dark, the tips 
of the hairs with a somewhat metallic glint. The two pairs of 
