The Chipmunks of the Genus Eutamias. 199 





 Tail not exceedingly long. 



Upper parts with at least 3 dorsal stripes distinctly black. 



Ground color of upper parts (including flanks and 

 inner pair of light stripes) uniform dull yellowish ful 

 vous from neck to tail ; outer pair of light stripes 

 slightly yellower and very broad; external lateral 

 dark stripe showing black (making 5 stripes showing 

 black) ; ear stripes and post-auricular spots sharply 

 defined and very conspicuous townsendi. 



Ground color of upper parts not uniform ; flanks and 

 fore part of back rich ferruginous ; outer pair of light 

 stripes whitish, more or less washed with fulvous, 

 and narrow ; external lateral stripe rusty ; ear stripe 

 and post-auricular spots only moderately defined. . .hindsi. 

 Upper parts with only one dorsal stripe (the median) distinctly 

 black. 



Top of head and rump grizzled gray ; outer pair of light 

 stripes whitish ; inner pair grizzled gray ; under parts 

 white; under side of tail dull fulvous senex. 



Top of head and rump grizzled fulvous or golden-ful 

 vous; outer pair of light stripes grizzled grayish, 

 inner pair yellowish-fulvous ; under parts strongly suf 

 fused with salmon-fulvous ; under side of tail deep rich 

 chestnut ochrogenys. 



5. REMARKS ON THE SPECIOSUS GROUP. 



The speciosus group is of hardly less interest than the townsendi 

 group, from which it differs totally in appearance. The mem 

 bers of the townsendi series are large and dark, with relatively 

 dull stripes ; those of the speciosus series are decidedly smaller 

 and lighter, with very bright stripes. Most members of the town 

 sendi group have become differentiated into full species, while 

 those of the speciosus group (except palmeri, which is separately 

 described) are still only subspecies. The townsendi group, as 

 already shown, has both Boreal and Transition representatives ; 

 those of the speciosus group are purely Boreal, inhabiting the 

 Hudsonian and Canadian zones from timber-line down to the 

 lower limit of spruce and firs. Their distribution therefore is 

 not continuous, but takes the form of isolated colonies occupy 

 ing the summits of the higher mountains from San Jacinto Peak, 

 in southern California, northward to the neighborhood of Dormer, 

 a little north of Lake Tahoe. The exact northern limit is un 

 known, but the group does not reach the mountains of northern 

 California. The mountains on which members of the group are 



