234 Mammals of Eastern Asia 
well able to climb trees, is a rock- and cliff-dwelling animal, 
making its nest in crevices. 
Forrest's Rock Squirrel, Rupestes forresti, differs from 
David's Rock Squirrel by the partly naked condition of the sole 
of the hind foot, in which only the hinder part is hairy. The 
front claws are elongated and blunt. The number of nipples is 
similarly 3 pairs. Ellerman considers Rupestes a subgenus of 
Sciuro tamias. 
The color is dark grayish brown, with a narrow indistinct 
whitish line beneath which is a dark line, on each side from 
shoulder to hips. The underparts are pale reddish brown, the 
flanks reddish ; from the chest to the chin is white. The tail is 
like the back, slightly darker at the tip. The head and body 
measure from 8 to 9 inches, the tail 6 to 7 inches, the hind foot 
about 2 inches. This species is known only from Yunnan near 
the valley of the Yangtse. It prefers cliffy places at about 
10,000 feet above sea-level. 
The Asiatic Chipmunks, genus Eutamias, are small chip- 
munk-like Squirrels with five well-marked black lines, inter- 
spersed with paler areas, along the back. Distinct stripes appear 
on the face. The ears are not tufted as in Tamiops. The cheek 
pouches are large. There are 4 pairs of nipples. The type and 
only species is E. sibiricus. 
The genus is represented in western North America but the 
True American Chipmunks, Tamias, are not found in Asia. 
Ellerman believes Eutamias, which has an extra pair of cheek 
teeth, to be a subgenus of Tamias. 
Chipmunks are small active terrestrial Squirrels living in 
burrows. 
The Asiatic Chipmunk, E. sibiricus, first recorded from near 
Tomsk, Siberia, has been divided into many geographical races, 
several of which are found along the eastern edge of the con- 
tinent. The most northerly race is E. s. jacutensis, which occu- 
pies the land north of the Sea of Okhotsk, reaching west into 
