Dorsal dark stripes reddish; size small to medium; skull of
medium size; braincase flattened.
Baculum: Shaft thick; keel low, 1/3 of length of tip; base of keel 1/2
of length of tip; tip 52 per cent of length of shaft; angle formed by
tip and shaft 110 deg.; distal 2/3 of shaft moderately compressed
laterally; base markedly widened; shaft short, 2.17 mm.
Differs from _E. umbrinus_ and _E. palmeri_, in distal 2/3 (rather than
1/2) of shaft moderately compressed laterally; from _E. bulleri_, in
keel smaller, shaft shorter, ridges on either side of tip distinct.
For comparisons with other species of chipmunks of western North
America, see the accounts of those species.
The structure of the baculum most closely resembles that of _E.
speciosus_ and the geographic ranges of these two species are in
juxtaposition.
_Specimen examined_: One from Coal Kilns, Panamint Mountains,
Inyo Co., California (CN).
#Eutamias umbrinus# (J. A. Allen)