The Chipmunks of the Genus Eutamias. 195 



of full specific recognition.* Three of the species are Boreal 

 namely, townsendi, ochrogenys, and senex. The remaining two, 

 hindsi and merriami, belong to the Transition and Upper Sonoran 

 belts. The group may be thus subdivided into two series, the 

 townsendi or Boreal series and the hindsi or Sonoran series. The 

 principal characters of the five, with the geographic ranges of 

 each, follow. Keys are given also, by means of which it is be 

 lieved that specimens in any pelage may be referred to their 

 proper species. 



Eutamias townsendi (Bachman). Townsend's Chipmunk. 



General characters. Under parts white at all seasons, moderately en 

 croached upon by color of sides; general coloration uniform dull fulvous 

 in post-breeding pelage, and uniform olive yellowish in winter pelage ; 

 post-auricular spots and ear stripes bluish gray, large and conspicuous ; 

 sides of face slightly washed with yellowish in winter pelage, more strongly 

 washed with fulvous in post-breeding pelage ; five dark dorsal stripes black, 

 more or less obscured by fulvous or yellowish tipped hairs, but black 

 always showing through ; median dorsal stripe longer anteriorly than in 

 any other species, always reaching to and often beyond anterior base of 

 ears; ant-orbital part of middle facial stripe obsolete as in ochrogenys ; 

 inner pair of light dorsal stripes in both pelages same color as general color 

 of upper parts ; outer pair yellower. 



Range. Northern Pacific coast region from the southwestern corner of 

 British Columbia (Westminster, Mt. Lehman, Chilliwack, and Mt. Baker 

 range) southward over the whole of western Washington and Oregon to 

 the Rogue River Valley ; eastward in the northern Cascades to the east 

 base of the range (head of Lake Chelan); westward to the extreme coast. 

 On the east slope of the Cascades E. townsendi crosses the Columbia River 

 and pushes southward a little beyond Mt. Hood. A short distance farther 

 south on this slope it is replaced by E. senex. 



Eutamias townsendi ochrogenys Merriam. Redwood Chipmunk. 



General characters. Under parts never white, but encroached upon by 

 color of sides in ordinary pelage, and strongly washed with salmon-ochra- 

 ceous in post-breeding pelage; sides of face suffused with ochraceous in 

 all pelages ; post-auricular spots bluish gray, large and conspicuous ; an 

 terior part of eye stripe obsolete. (For full description see p. 206.) 



Range. A narrow strip along the coast of southern Oregon and northern 

 California, from near the mouth of Rogue River in Oregon to Cazadero, 

 a short distance north of San Francisco Bay, in California. 



* It is an interesting fact that most, if not all, of the species have one 

 pelage in which they resemble one pelage of one of the other species, 

 while the other pelage is always distinctive. In some instances it is the 

 winter pelage, in others the post-breeding pelage that is distinctive. 



