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.] DISCUSSION In California, Johnson (1943) recognized ten species of chipmunks and assigned these to the five main groups of species which were proposed by Howell (1929). In characterizing each species, Johnson (_op. cit._) not only made a careful study of skins and skulls, but also employed many ecological data. Study of the bacula of the Californian chipmunks supports Johnson's (_op. cit._) conclusion that there are ten species, but suggests that there are three (not five) groups of species in California--as well as elsewhere within the geographic range of the subgenus _Neotamias_. The three groups are (see figs. 1-19): 1. _minimus_-group (_E. alpinus_, _E. minimus_, _E. townsendii_, _E. sonomae_, _E. amoenus_, _E. dorsalis_, and _E. merriami_); 2. _quadrivittatus_-group (_E. quadrivittatus_, _E. ruficaudus_, _E. cinereicollis_, and _E. quadrimaculatus_); and 3. _speciosus_-group (_E. speciosus_, _E. panamintinus_, _E. umbrinus_, _E. palmeri_, and _E. bulleri_).