WESTERN CHIPMUNK 



Ochraceous Chipmunk.— Ew/awm^ amcenus ochraceus Howell 

 Larger than typical amosnus, more ochraceous above par- 

 ticularly on head and rump, less blackish in dorsal stripes 

 tail paler above and below. Found "only in the Siskiyou 

 Mountain region of northern California and southern Ore- 

 gon. ..." (Howell) 



Mono Chipmunk. — Etitamias amcBniis monoensis Grinnell and 

 Storer. 

 Resembling typical amcenus but general tone paler and 

 grayer, light-colored stripes whiter; size as in typical 

 amcenus. Found "on the arid crest and east wall of the 

 central Sierra Nevada [California], where it is characteristic 

 of the Canadian Zone." (Grinnell) 

 Buff-bellied Chi^mniik. ~ Etitamias amcenus luteiventris 

 (Allen). 

 Very similar in size and proportions to typical amcenus and 

 colored very much like it; underparts with strong suffusion 

 of ochraceous buff. Found in Transition and Canadian 

 Zones from southern Alberta south into Montana and 

 Wyoming. 



Bitterroot Valley Chipmunk.— Ewtowm^ amcenus vallicola 

 Howell. 

 Resembling luteiventris, "but averaging paler throughout 

 especially the head, upperparts of body and under surface 

 of tail. Total length, 8.8 inches; tail vertebra^ 4 inches- 

 hmd foot 1.3 inches. "This subspecies is apparently con- 

 fined to the Bitterroot Valley [Montana] and the adjacent 

 foothills but the exact limits of its range are not known " 

 (Howell) 



Gray-tailed Chi^mnn^.—Eutamias amcenus canicaudus (Mer- 

 riam). ^ 



Resembling luteive^itris but with tail edged with gray rather 

 than buff; with broad, conspicuous stripes and general tone 

 of _ upperparts vmaceous gray. Total length, 92 inches- 

 tail vertebr^, 4.2 inches; hind foot, 1.32 inches. Found in 

 i ransition Zone of eastern Washington. 



Columbian Chipmunk. — Eutamias ammius affinis (Allen) 

 Closely reseml)ling typical amcenus and superficially 'verv 

 similar to typical quadrivittatus. This subspecies is given 

 m Howell s list of the forms of Eutamias, but I can discern 

 no descnbable external differences between it and tvpical 

 amcenus. Found in Transition and Canadian Zones of 

 southern British Columbia. 



Hollister Chipmunk. — Eutamias ama^nus ludibundus (Hoi 

 lister). ^ 



"A large member of the amcenus group, nearest to 



luteiventris, but with sides of quite a different tint -'darker 

 and more tawny, less bright and yellowish. Underparts 

 about the yellowish color of luteiventris; tail darker be 

 neath." (Hollister) Total length, 8.6 inches; tail verte- 

 br^E, 3.8 inches, hmd foot, 1.36 inches. "Found along the 



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