Figure 1

Pelage silky; tail bright orange beneath; markings relatively

obscure; size small; skull broad, flattened, and large in

proportion to body.

Baculum: Shaft thin; keel low, 1/7 of length of tip; tip 39 per cent of

length of shaft; angle formed by tip and shaft 135 deg.; distal 1/3 of

shaft slightly compressed laterally; base slightly wider than shaft;

shaft short, 2.17 mm.

Differs from _E. speciosus_, _E. panamintinus_, _E. umbrinus_, _E.

palmeri_, and _E. bulleri_, in base not markedly widened, and shaft

thinner; from _E. quadrivittatus_, _E. ruficaudus_, _E. cinereicollis_,

and _E. quadrimaculatus_, in shaft thinner, baculum shorter; from _E.

townsendii_, in base not dorsoventrally thickened, base not so widened;

from _E. sonomae_, in ridges on either side of tip not enlarged, base

not dorsoventrally thickened; from _E. amoenus_, _E. minimus_, and _E.

dorsalis_, in keel lower, angle formed by tip and shaft more distinct;

from _E. merriami_, in baculum markedly shorter, base not incised

dorsally.

_Specimen examined_: One from Big Cottonwood Meadows, S of Mount

Whitney, 10,000 ft., Inyo Co., California (CN).

#Eutamias minimus# (Bachman)

The Baculum in the Chipmunks of Western North America · 第 23 / 44 题