l62 
The Mammals of Colorado 
County in various places, and east almost to Buford P. O. It is 
found on the White River Plateau, at Mud Springs, Garfield County, 
8,850 feet, and was seen by me on West Fork of Elk Creek, six 
or eight miles above Newcastle, Garfield County. Specimens from 
Fort Garland, and Antonito, in the San Luis Valley are referred by 
the Biological Survey to this form, and I have taken it at Moffat, 
Saguache County; and Mosca, San Luis Lake, and Medano Ranch, 
Costilla County. Outside of Colorado it is found in northeastern 
Utah and southwestern Wyoming. 
Habits. — Its habits seem to be much the same as those 
of the preceding form. At Mud Springs they seemed to be 
occupying abandoned workings of pocket gophers, which 
had honeycombed much of the country with their burrows. 
Citellus variegatus grammurus (Lat. variegatus, made 
of different sorts or colors ; grammurus , pertaining 
to grass). Rock Squirrel. 
Sciurus grammurus Say, Long's Exped. Rocky Alts., ii., p. 72 
(1823). 
Type locality. — Purgatoire River, Colorado, Lat. 37° 32', Lon. 
103° 30'. 
Measurements. — Total length, 18.0 ; tail vert., 7.5 ; hind foot, 2.35. 
Description. — (From specimen taken at Colorado Springs, Sept. 
13th) : Upper surface of animal, except head, presenting a mottled 
or dappled appearance ; this is due to the fact that the basal half 
of the hairs is black, and the other part either gray or rusty rufous, 
with black tips; the rufous area extends along back from behind 
shoulders to and out into the tail a short distance ; the flanks and 
upper surfaces of feet are rufous, latter rather pale; the sides and 
neck light gray, top of head grizzled rufous; light ring around eye; 
chin and throat rusty, rest of under surface of body mixed whitish 
and rusty. 
The tail is quite full and bushy, and except the basal two inches 
is mixed gray and black both above and below, the black rather 
predominating above and the gray below; on the basal two inches 
the gray is replaced by the rufous ; the individual hairs of the tail are 
banded; about one-half inch of base light; then one-quarter inch 
black, then one-quarter inch light, one-quarter inch black; one- 
quarter inch light tip. Examined separately these light portions 
are white, or practically so, but in combination with the black 
portions produce, the gray effect. 
