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 hopiensis_, No. 783 UU; from Moab, 4,500 ft.,
Grand Co., Utah.
11. _E. ruficaudus ruficaudus_, No. 33884; from 1 mi. W and 2 mi. S
Summit, 5,000 ft., Flathead Co., Montana.
12. _E. ruficaudus simulans_, No. 41478; from 13 mi. E and 5 mi. N
Coeur d'Alene, Kootenai Co., Idaho.
13. _E. cinereicollis cinereicollis_, No. 208621 BS; from Mount
Thomas, White Mountains, Apache Co., Arizona.
14. _E. quadrimaculatus_, No. 95780 BS; from Mountains near Quincy,
Plumas Co., California.
15. _E. speciosus sequoiensis_, No. 29135/41203 BS; from Mount
Whitney, Tulare Co., California.
16. _E. panamintinus panamintinus_, No. 12502 CN; from Coal Kilns,
Panamint Mountains, Inyo Co., California.
17. _E. umbrinus umbrinus_, No. 38062; from Paradise Park, 21 mi. W
and 15 mi. N Vernal, 10,050 ft., Uintah Co., Utah.
18. _E. umbrinus montanus_, No. 20105; from 1/2 mi. E and 3 mi. S
Ward, 9,400 ft., Boulder Co., Colorado. Dorsal view.
19. _E. bulleri bulleri_, No. 193142 NM; from Sierra del Valparaiso,
Zacatecas.]