1936] MAMMALS OF OREGON 137 



General habits. In habits, Hollister's chipmunk is practically in- 

 distinguishable from the Klamath chipmunk, with which it inter- 

 grades to the southward, the same nervous active little sprite, but 

 easily distinguished by voice and actions from the larger, slower 

 Cooper's chipmunk, with which it comes in contact along its western 

 border line. 



EUTAMIAS AMOENUS OCHRACEUS HOWEIX 

 YELLOW CHIPMUNK; OCHBACEOUS CHIPMUNK 



Eutamias amoenus ochraceus Howell, Jour. Mammal. 6 : 54, 1925. 



Type. From Siskiyou Mountains, Studhorse Canyon, Calif. 



General characters. Slightly larger and paler than typical amoenus. 

 Summer pelage usually with only 1 black dorsal stripe, 4 brown and 4 whitish 

 stripes, sometimes 5 brown and 4 gray, and sometimes 3 black, 2 brown, 2 gray, 

 and 2 whitish ; stripes on sides of head, and patch back of ears, conspicuously 

 white; sides bright ochraceous; lower parts and feet buffy; lower surface of 

 tail pale ochraceous, edges and top black with buffy tipped hairs. Winter 

 pelage darker and grayer, the back with 3 black and 4 gray stripes. 



Distribution and habitat. This pale form of chipmunk has a 

 rather restricted distribution in the Siskiyou Mountains of south- 

 western Oregon and northwestern California (fig. 22). There are 

 typical specimens from near Ashland and along the line of the rail- 

 road over the Siskiyous, but the limits of range have not been well 

 established. 



At the type locality Hollister collected two specimens in the canyon 

 at 6,500 feet altitude, but was unable to get more or to find them 

 in other parts of the western end of the range. 



General habits. Apparently nothing has been written on the habits 

 of these chipmunks to indicate that they are in any way different 

 from those of typical amoenus over its wide range. 



EUTAMIAS MINIMUS PICTUS (ALLEN) 



SAGEBRUSH CHIPMUNK ; GREAT BASIN CHIPMUNK ; DESERT CHIPMUNK ; 

 PAINTED CHIPMUNK 



Tamias minimus pictus Allen, Amer. Mus. Nat. Hist. Bull. 3: 115, 1890. 

 Eutamias minimus scrutator Hall and Hatfleld, Calif. Univ. Pubs., Zool. 40 (6) : 

 325, 1934. Type from White Mountains, Calif. 



Type. Collected at Kelton, Utah, by Vernon Bailey, June 1888. 



General characters. Very small (pi. 28, A), form slender, tail long, color 

 gray with 9 narrow stripes on back. Summer pelage, back with 5 black, 2 light 

 gray, and 2 dark gray stripes; sides and feet and middle of tail below buffy 

 gray; sides, top, and tip of tail black, with gray tips to long hairs; belly 

 white or light gray. Winter fur clearer gray with less buffy. 



Measurements. Average: Total length, 200 mm; tail, 86; foot, 30; ear (dry), 

 12. An adult female at Malheur Lake measured 190; 93; 31; 14 mm, and 

 weighed 33 g. 



Distribution and habitat. These tiny chipmunks occupy most of 

 the sagebrush valleys of the Great Basin region, including the sage- 

 brush plains of Oregon east of the Cascade Mountains, in upper 

 Sonoran and Transition Zones (fig. 23). They are rarely found in 

 the timber or away from sagebrush, in which they climb as other 

 -larger chipmunks do in the trees and larger bushes. 



General habits. The homes of these little chipmunks are in bur- 

 rows in the ground which they dig or borrow from other rodents, and 



