358 THE QUADRUPEDS OF ARIZONA. 
Of the Striped Ground Squirrels, or “Chipmunks,” 
composing the genus Tamias, only one species is common, 
which is the Gila Chipmunk (T. dorsalis Baird). It is 
a beautiful little animal, rather larger than the common 
Eastern one, and conspicuously different in the character 
of the dorsal stripes. It was first described from the 
deserts of Southern Arizona, but I found it abundant at 
Fort Whipple, and it may extend considerably farther 
north. Unlike most others, it is a rock-loving species, 
and rarely quits its favorite resorts. Among masses of 
lava and gneiss it may be seen tripping lightly and grace- 
fully, its pretty tail held arched downward, or flirted 
from side to side. It is a shy and suspicious animal, 
though so rarely molested, and scarcely exhibits the fa- 
miliarity of disposition shown by its Eastern congener. 
When alarmed, it hurries precipitately to the mouth of 
its retreat, where, as if conscious of security, it sits and 
chatters an angry defiance at the intruder. It isa per- 
manent resident around Fort Whipple, but hardly seen 
during the winter, which it passes in its burrows, in 
which an abundant supply of food, in the shape of nuts, 
acorns, and seeds, is laid up during the fall *for winter 
use, 
I think that one other species of Tamias— possibly T. 
ownsendii—occurs rarely, but E cannot speak posi- 
tively on this point. I have no knowledge of the exist- 
ence of any Flying Squirrels (Pteromys) in Arizona. 
The genus Spermophilus, comprising the true Ground 
Squirrels, or Squirrel Marmots, is well represented by 
quite numerous species, though none of them occur in 
such multitudes as to form the colonies for which some 
are so noted in other countries. 
One of the smallest and the most beautiful of our 
