300 Mammals of Eastern Asia 
eastern Himalayas. This form is colored reddish gray above, 
with a sprinkle of blackish guard hairs, reddish yellow on the 
sides, and creamy white beneath, with the bases of the hairs 
gray. The ears and the sides and top of the muzzle are choco- 
late. The tail is brown above, white beneath ; the hind feet and 
the fingers of the hands are white. The length of the head and 
body is 2% inches, tail 4 1 / 4 inches. 
The Jumping Mice, genus Zapus, are known in the Old 
World only from the Chinese uplands of Szechwan and Kansu. 
Fig. 61. Szechwan Jumping Mouse, 
Zapus szechwanus. 
The Szechwan Jumping Mouse, Z. szechwanus, is tawny brown 
with a scattering of black hairs. Along the back runs a very 
broad band of darker olive-brown color. The underparts are 
white with a median stripe of tawny. The tail is dark gray above 
and white beneath. There are 4 teeth in each molar toothrow. 
The nearest relatives are the American Jumping Mice. 
THE TRUE JERBOAS (FAMILY DIPODID^) 
The kangaroo-like aspect of these rodents has already been 
indicated. The Jerboas live in deserts. They have developed a 
