Utah Chipmunk 
171 
B. Smaller; length less than 8.25. 
a. Largest length, 7.75-8.25. Tail fringed with rufous-tipped 
hairs; light stripes distinct, outer dark stripe not very 
strong; tail bushiest of this section; hind foot, 1.25. 
E. amoenus operarius, p. 176 
b. Small; length, 7.25-7.50. Hind foot, 1.14. Pale and 
bleached in color; tail not at all bushy, with rufous 
fringe, E. minimus, p. 177 
c. Size as in b. Color dark; in midsummer pelage colors intense 
deep chestnut; dark stripes very black and broad, light 
stripes narrow; tail without rufous fringe. Winter 
pelage grayer. E. minimus consobrinus, p. 1 79 
d. Size as in b. Color in winter pelage very gray, especially 
on sides and flanks; summer pelage similar to E. mini- 
mus, but less extensive rufous on sides, and with grayer 
flanks and shoulders. E. minimus caryi, p. 180 
Eutamias dorsalis utahensis (Lat. dorsalis, pertaining 
to the back; utahensis, of or from Utah). 
Utah Chipmunk. 
Eutamias dorsalis utahensis Merriam, Proc. Biol. Soc. Wash., 
xi., p. 2 10 (1897). 
Type locality. — Ogden, Utah (Vernon Bailey). 
Measurements. — Total length, 8.75; tail vert., 3.5 ;hind foot, 1.3. 
Description. — (From a specimen taken at Douglas Spring, Routt 
County, June 24th): General tone grayish above, dull mixed 
gray and rufous on rump; sides pale rufous or chestnut, as is also 
the upper surface of the foot; beneath yellowish white; stripes 
indistinct; median stripe blackish, inner dark pair grizzled, mixed 
blackish and rusty rufous, outer dark pair practically obsolete ; 
inner pair of light stripes grayish white, quite wide ; outer pair also 
grayish white, but narrow; indistinct grayish white post-auricular 
spot; posterior half of ear grayish white ; light facial stripes whitish ; 
a rusty stripe through eye; upper and lower facial stripes mixed 
blackish and rufous, the latter stripe rather indistinct ; top of head 
mixed grayish and rusty; upper surface of tail blackish, fringed 
with white-tipped hairs; under surface rufous, bordered with 
blackish. 
Distribution. — The Utah Chipmunk is found in Utah, eastern 
Nevada, northern Arizona, and northwestern Colorado, in the 
Upper Sonoran and Transition Zones. In Colorado it is found in the 
Escalante Hills, Routt County, ranging east of the Snake River 
to the west flank of Cross Mountain, and probably inhabiting most 
