Nciv Ground Squirrels. 137 



more arched in the posterior frontal region than in speciosus. 

 The.molariform teeth are somewhat heavier, and the last upper 

 molar has the heel more developed. 



General Remarks. Tamias callipeplus differs from both speciosus 

 and panamintinus in having the hinder parts of the body yel- 

 lowish instead of gray, and in the purer white and larger size of 

 the post-auricular spots. It agrees with panamintinus and differs 

 from speciosus in the vinaceous tinge of the back of the neck and 

 inner pair of pale dorsal stripes, and in the color of the tail. It 

 differs from panamintinus and agrees with speciosus in the bright- 

 ness and sharpness of the facial stripes and ear stripes, the great 

 breadth of the outer pair of dorsal white stripes, in the posterior 

 extension of the dorsal stripes over the rump, and in the large 

 size of the hind foot. 



Tamias callipeplus is treated as a full species instead of a sub- 

 species on account of its isolated geographic position, intergrades 

 being impossible because the mountains on both sides of Mount 

 Piilos do not attain sufficient altitude to provide the cool tem- 

 perature required by the species. 



Tamias alpinus sp. nov. 



ALPINE CHIPMUNK. 



Type from BIG COTTONWOOD MEADOWS, HIGH SIERRA, CALIFORNIA, just 

 south of Mount Whitney (altitude, 3,050 meters or 10,000 feet). No. f fff- 

 9 yg.-ad. United States National Museum, Department of Agriculture 

 collection. Collected by Basil Hicks Dutcher August }2, 1891 (original 

 number, 191). 



Measurements of Type Sped men (taken in flesh). Total length, 189; tail 

 vertebrae, 82; hind foot, 29. Ear from notch, 13 (in dry skin). Average 

 measurements of 15 specimens from type locality : total length, 185 ; tail 

 vertebrae, 79; hind foot, 29.3. 



General Characters. Size, small ; resembles T. minimus pictus 

 in size, proportions, and general appearance, but is much paler 

 in breeding pelage and much more ferruginous in midsummer 

 pelage ; may be distinguished from pictus in all pelages by the 

 tail, which is much broader and more bushy, hoary above, and 

 broadly tipped with black both above and below. 



Color. Fall pelage : General color of upper parts, hoary gray 

 suffused on the flanks with buffy-ochraceous ; median dorsal 

 stripe dusky, obscured by pale rusty ; lateral dorsal dark stripe 

 pale ferruginous ; inner pair of white stripes hoary gray ; outer 

 pair white and very broad (as in speciosus')', post-auricular 



21 RIOT,. Sor. WASH., VOT,. VIII, 1893. 



