i66 The Mammals of Colorado 
bling the chipmunks in external appearance, though larger, 
is found in western North America, from about Lat. 55° 
southward through the United States into the State of 
Chihuahua, Mexico, and from the eastern foot-hills of the 
Rocky Mountains westward nearly or quite to the Pacific 
Coast. Nine species and subspecies are given in Elliot's 
Check-list, of which two are found in Colorado. 
Key of the Species 
A. Darker in color; black stripes prominent and pronounced. 
C. lateralis, p. 166 
B. Pale in color; dark stripes not very marked, hardly to be 
called black. C. wortmani, p. 169 
Callospermophilus lateralis (Lat., belonging to the side). 
Say's Ground Squirrel. Big Chipmunk. 
Sciurus lateralis Say, Long's Exp. Rocky Mts., ii., p. 46 (1823), 
Type locality. — The Arkansas River, about twenty-six miles 
below Canon City, Colorado. 
Measurements. — Total length, 11; tail vert., 3.5; hind foot, 1.65. 
Description. — (From a specimen taken May 19th, near Sheephom 
Pass, Grand County, Colorado) : Back between stripes, nape, and 
top of head a mixture of black, grayish white, and rufous; inner pair 
of stripes black, not very well defined; light stripes yellowish rusty 
white, extending from shoulder to hip; outer dark stripe black, 
quite wide and well defined ; flanks and sides of neck deep bright 
chestnut; upper surfaces of feet a pale yellowish rusty color; a 
light ring around eye; below, light rufous, black bases of hairs 
showing through; upper surface of tail mixed black and chestnut, 
and chestnut border; under surface chestnut, rather ill-defined 
black border, with chestnut outside that again. In worn winter 
and early spring pelages the colors are grayer, and the black stripes 
are often quite rusty. A July specimen has top of head chestnut. 
Distribution. — This species is found through the mountainous 
parts of Colorado, New Mexico, and Arizona. In Colorado it occurs 
from the east base of the mountains westward, ranging down to a 
little below 6,000 feet elevation. 
Habits. — A mountain animal, ranging from the foot-hills 
nearly to timber-line. A frequenter of rocks and bushy 
places, living in holes and burrows. Its food consists of 
