rge;
skull large, long, and narrow; rostrum deep.

Baculum: Shaft thin; keel low, 1/10 of length of tip; tip 27 to 31 per
cent of length of shaft; angle formed by tip and shaft 130 deg.; distal 1/4
of shaft slightly compressed laterally; base deeper and wider than
shaft; shaft of medium length, 3.03 to 3.30 mm.; ridges on either side
of tip strongly developed, partly obscuring keel from side.

Differs from _E. speciosus_, _E. panamintinus_, _E. umbrinus_, _E.
palmeri_, and _E. bulleri_, in ridges on either side of tip strongly
developed, shaft thin, base not markedly widened, tip proportionally
shorter; from _E. quadrivittatus_, _E. ruficaudus_, _E. cinereicollis_,
and _E. quadrimaculatus_, in shaft thin, ridges on either side of tip
strongly developed, baculum shorter; from _E. amoenus_ and _E.
dorsalis_, in keel lower, ridges on either side of tip strongly
developed, base thicker and wider; from _E. merriami_, in markedly
shorter, ridges on either side of tip strongly developed, tip
proportionally longer, base wider and deeper but not incised dorsally.

For comparisons with _E. alpinus_, _E. minimus_, and _E. townsendii_,
see the accounts of those species.

_Specimens examined_: 5.

_E. sonomae alleni_: California: _Marin Co._: Unspecified, 1
(NM).

_E. sonomae sonomae_: California: _Siskiyou Co._: Salmon Mts., W
slope, W of Etna, 1 (BS). _Shasta Co._: Redding, 1 (BS).
_Mendocino Co._: Cahto, 1 (BS).

#Eutamias amoenus# (J. A. Allen)

Figure 5

Upper parts generally ochraceous; venter frequently buffy; size
small to medium; zygomatic arches usually appressed to cranium;
frequently difficult to distinguish from _E. minimus_.

Baculum: Shaft thin; keel low, 1/5 of length of tip; tip 30 to 35 per
cent of length of shaft; angle formed by tip and shaft 130 deg.; distal 1/5
of shaft slightly compressed laterally; shaft short, 2.37 to 2.96 mm.

Differs from _E. speciosus_, _E. panamintinus_, _E. umbrinus_, _E.
palmeri_, and _E. bulleri_, in base not markedly widened, shaft thinner;
from _E. quadrivittatus_, _E. ruficaudus_, _E. cinereicollis_ and _E.
quadrimaculatus_, in shaft thinner, baculum usually shorter, tip
shorter; from _E. dorsalis_, in keel lower, angle formed by tip and
shaft 130 deg., usually smaller; from _E. merriami_, in being markedly
shorter, and in base not being dorsally incised, tip proportionally
longer.

For comparisons with _E. alpinus_, _E. min