mulans_.

_Specimens examined_: 17.

_E. ruficaudus ruficaudus_: Montana: _Flathead Co._: 1 mi. W and
2 mi. S Summit, 5,000 ft., 2. _Ravalli Co._: Big Hole Hill,
6,000 ft., 2; Big Hole Hill, 6,600 ft., 1; Continental Divide,
Big Hole Hill, 7,000 ft., 1.

_E. r. simulans_: Idaho: _Bonner Co._: Priest Lake, 1 (BS).
_Kootenai Co._: 13 mi. E and 5 mi. N Coeur d'Alene, 3. _Shoshone
Co._: Mullan, 1 (BS). _Clearwater Co._: 25 mi. E and 16 mi. N
Pierce, 6.

#Eutamias cinereicollis# (J. A. Allen)

Figure 13

General tone of upper parts dark grayish tawny; size medium to
large; skull large; braincase widened.

Baculum: Shaft thick; keel proportionally low, 1/5 of length of tip; tip
34 per cent of length of shaft; angle formed by tip and shaft 145 deg.;
distal 1/3 of shaft slightly compressed laterally; base slightly
widened; shaft long, 4.88 mm.

Differs from _E. quadrimaculatus_, in keel lower, ridges on either side
of tip weakly developed, angle formed by tip and shaft larger; from _E.
speciosus_, _E. panamintinus_, _E. umbrinus_, _E. palmeri_, and _E.
bulleri_, in shaft longer, base not markedly widened, angle formed by
tip and shaft much larger.

For comparisons with _E. alpinus_, _E. minimus_, _E. townsendii_, _E.
sonomae_, _E. amoenus_, _E. dorsalis_, _E. merriami_, _E.
quadrivittatus_, and _E. ruficaudus_, see the accounts of those species.

_Specimen examined_: One from Mount Thomas, White Mountains,
Apache Co., Arizona (BS).

#Eutamias quadrimaculatus# (Gray)

Figure 14

General tone of upper parts bright reddish; pattern
inconspicuous; light and dark facial stripes strongly
contrasting; size large; skull relatively small and slightly
built.

Baculum: Shaft thick; keel relatively low, 1/4 of length of tip; tip 27
per cent of length of shaft; angle formed by tip and shaft 120 deg.; distal
1/3 of shaft slightly compressed laterally; base slightly wider than
shaft; shaft long, 4.35 to 5.28 mm.

Differs from _E. speciosus_, _E. panamintinus_, _E. townsendii_, _E.
umbrinus_, _E. palmeri_, and _E. bulleri_, in shaft markedly longer;
base not markedly widened; angle formed by tip and shaft larger; tip
proportionally shorter.

For comparisons with all other species of chipmunks from western North
America, see the accounts of those species.

_Specimens examined_: 4.

California: _Plumas Co._: Mountains near Quincy, 1 (BS). _P