136 Merriani — Neu) Ground Squirrels. 



Geographic Distribution. — Tiimias panamintinus is an inhalntant 

 of the desert ranges of the west side of the Great Basin in Cali- 

 fornia and Nevada, where 110 specimens were obtained b_y the 

 Death Valley Expedition. 



Tamias callipeplus sp. nov. 



MOUNT PIXOS CHIPMUNK. 



Type from summit of Mount Pinos, Ventura County, California. Xo. 

 frill & yg-^^-d. United States National Museum, Department of A-gri- 

 culture collection. Collected by E. W. Nelson October 20, 1891 (original 

 number, 1344). 



Measurements of Type Specimru (taken in flesh). — Total length, 212; tail 

 vertebrje, 92; hind foot, 33.5. Average measurements of four specimens 

 from type locality: total length, 210; tail vertebr?e, 91.7; hind foot, 34. 



General Characters. — Agrees with speci.osas, its nearest relative, 

 in size, proportions, and pattern of markings, including the great 

 breadth of the outer white dorsal stripe. It differs from speciosus 

 in having the thighs and rump yellowish instead of gray, the 

 back of the neck and inner pair of light dorsal stripes vinaceous- 

 drab instead of gray ; the post-auricular patches larger, purer 

 white, and more sharply defined, and the black on the tail much 

 less extensive. Ears large. 



Color. — Winter pelage: No gray anywhere; top of head, back 

 of neck, and inner pair of light dorsal stripes vinaceous drab) 

 tinged with ochraceous on the shoulders, becoming fulvous on 

 the flanks, and yellowish on the thighs and rump ; outer white 

 stripes very broad (as in- speciosus) and slightly obscured poste- 

 riorly by dark-tipped hairs ; median dorsal stripe dark umber- 

 brown, bordered and obscured bv rusty ; inner pair of dark 

 stripes ferruginous; outer })air fulvous, not defined below, pass- 

 ing into fulvous of flanks ; post-auricular spots large, sharply 

 defined, and pure white ; ear stripes sharp, the posterior pure 

 white, the anterior black, edged in front basally witli rusty ; 

 facial stripes intensely colored and sharply defined, the middle 

 or orbital stripe black, becoming rast}^ at the base of the ear; 

 feet faintly washed with fulvous; tail orange rufous, broadly 

 tipped and narrowly bordered with black, and edged with yel- 

 lowish ; the rufous obscured on upper surface by black subapical 

 and yellowish apical zones on the hairs ; belly and throat pure 

 white, the dark basal color showing through in places. 



Cranial and Dental Characters. — No cranial characters of im- 

 portance have been discovered, though the brain case is slightly 



