44 PROCEEDINGS OF THE ACADEMY OF [1895. 



proportion, colors darkest of the T. lateralis group. Top and sides 

 of head and sides of neck to and including forelegs, chestnut, shaded 

 with black ; eyelids pale buff, in marked contrast to their surround- 

 ings; lips, throat, breast, sides of belly and hams, rusty; feet paler 

 rusty ; back, from occiput to and including root of tail and defined 

 laterally by red of neck and black of inner body stripe and poste- 

 riorly by white of middle stripe, including flanks and upper hind 

 legs, grizzled, rusty black. White body stripe longest, reaching from 

 base of neck nearly to tail ; inner black stripe shortest, about half 

 the width and length of outer stripe, which latter is the same width 

 as white stripe, and about two- thirds as long. Belly and chest uni- 

 form grizzled black, the bases of hairs sooty, their tips fulvous. Tail, 

 above, like back on proximal third, becoming more distinctly mar- 

 gined with a subterminal black band which becomes broader and 

 blacker at tip, the outer tips of hairs rusty ; beneath, the tail is 

 lighter, with a broad central area of reddish-yellow within the black 

 border. Skull, not appreciably different from that of lateralis, ex- 

 cept in its larger size. 



Measurements (of type, in millimeters). — Total length, 317; tail 

 vertebrae, 114 ; hind foot, 46: (Average of five adults, length, 305; 

 tail, 112; foot, 46). Skull — Total length, 46; basilar length, 38; 

 zygomatic expansion, 28.8; interorbital constriction, 12; length of 

 nasals, 15.7; length of mandible, 28; width of mandible, 16.2. 



Seventeen chipmunks, taken by Mr. Rupert in the months of July 

 and September, in the vicinity of Snoqualmie Pass, Cascade Mts., 

 Washington, show closest affinities, in many respects, with T. lateralis 

 einerascens 9 in the "red phase" described by Dr. Merriam. They 

 differ from einerascens in the fact that there is no "gray phase," the 

 adults of both sexes being similarly colored. They are also blacker 

 and browner throughout and have a relatively smaller body, larger 

 foot, and longer tail than einerascens, and the median lateral stripe 

 does not reach the ears as in that form and in lateralis. 



The very close agreement of the skulls of lateralis and saturatus 

 indicates that the latter is nothing more than the usual "Cascade 

 representative" of a Rocky Mountain type, and it is probable that 

 the relationship of einerascens to lateralis is quite as close. 



2 Merriam, N. Amer. Fauna, No. 4, 1S<U), 20. 



