Nc'ir Ground SqnlrreU. 137 



more arched in the posterior frontal region tlian in spcciosus. 

 The molariform teeth are somewhat heavier, and tlie last np])er 

 molar has the heel more developed. 



(jencral Remarks. — Tamias calllpeplH.'s differs from both speciosus 

 and panaminthiits 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 panamintinics and differs 

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

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

 differs from panainintuiics and agrees Avith speciosus in the bright- 

 ness and sharpness of the facial stripes and ear strijjes, 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 caUipeplus is treated as a full species instead of a sub- 

 species on account of its isolated geographic position, intergrades 

 being impossible Ijecause tlie mountains on both sides of Mount 

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

 perature required l)y the species. 



Tamias alpinus s}). iiov. 

 A LPJ XK cm I'.Ar rx k . 



Type from Big Cottonwood Meadows, High Sierra, California, just 

 south of ]Mouut Whitney (ahitude, 3,050 meters or 10,000 feet). No. |§f |f 

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

 collection. Collected by Basil Hicks Dutcher August 12, 1891 (original 

 number, 191). 



3feasurementx of Type Sped iiu'ii (taken in flesh). — Total length, 189; tail 

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

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

 vertebrae, 79; hind foot, 29.3. 



General Characters. — Size, small ; resembles T. viinimus 'ptctus 

 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 buff'y-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 ver}' broad (as in speciosu><) ; post-auricular 



21— BioT,. Sor. Wash., Vot,. VHI. 1803. 



