tone of upper parts grayish tawny; ocular stripe pale;
skull, rostrum, nasals, and upper incisors shorter than in _E.
umbrinus_.

Baculum: Indistinguishable from that of _E. umbrinus_. This supports the
opinion of previous students that _E. palmeri_ is a close relative of
_E. umbrinus_ which occurs immediately to the north and east.
Intergradation does not occur between these two species, for, low-lying
terrain, inhospitable to chipmunks, isolates _E. palmeri_ from its
relatives. (Verbal information from E. R. Hall.)

_Specimen examined_: One from Charleston Peak, 8,000 ft., Clear
Creek Co., Nevada.

#Eutamias bulleri# (J. A. Allen)

Figure 19

General tone of upper parts dark; dorsal dark stripes
conspicuous and black; size large; skull large.

Baculum: Shaft thick; keel high, 1/2 of length of tip; keel long, 1/2 of
length of tip; tip 40 to 48 per cent of length of shaft; angle formed by
tip and shaft 100 deg.; base markedly widened; shaft of medium length, 3.30
mm.

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

The large size of the keel of the baculum in this species is distinctive
among chipmunks of western North America.

_Specimens examined_: 2.

_E. bulleri bulleri_: Zacatecas: Sierra de Valparaiso, 2 (NM).

[Illustration: FIGS. 1-19. Lateral view of right side, unless otherwise
indicated, of the baculum in each of the species of chipmunks (subgenus
_Neotamias_) of western North America:

1. _Eutamias alpinus_, No. 12577 CN; from Big Cottonwood Meadow,
Tulare Co., California.

2. _E. minimus consobrinus_, No. 25439; from 13 mi. S and 2 mi. E
Robertson, 9,200 ft., Uinta Co., Wyoming.

3. _E. townsendii cooperi_, No. 53169; from Brooks Meadow, 4,300
ft., 9 mi. ENE Mt. Hood, Hood River Co., Oregon.

4. _E. sonomae sonomae_, No. 98436 BS; from Redding, Shasta Co.,
California.

5. _E. amoenus luteiventris_, No. 33811; from 7 mi. W West
Yellowstone, 7,000 ft., Fremont Co., Idaho.

6. _E. dorsalis dorsalis_, No. 213415 BS; from 3 mi. N Ft. Whipple,
5,000 ft., Yavapai Co., Arizona.

7. _E. merriami merriami_, No. 1270 LA; from Mount Pinos, Ventura
Co., California.

8 and 9. _E. quadrivittatus quadrivittatus_, No. 35648/47919 BS;
from Canon City, Fremont Co., Colorado. Figure 9 in dorsal view.

10. _E. quadrivittatus hopiens