Figures 17-18

General tone of upper parts grayish tawny; ocular stripe pale;

skull, rostrum, nasals, and upper incisors shorter than in _E.

umbrinus_.

Baculum: Indistinguishable from that of _E. umbrinus_. This supports the

opinion of previous students that _E. palmeri_ is a close relative of

_E. umbrinus_ which occurs immediately to the north and east.

Intergradation does not occur between these two species, for, low-lying

terrain, inhospitable to chipmunks, isolates _E. palmeri_ from its

relatives. (Verbal information from E. R. Hall.)

_Specimen examined_: One from Charleston Peak, 8,000 ft., Clear

Creek Co., Nevada.

#Eutamias bulleri# (J. A. Allen)

The Baculum in the Chipmunks of Western North America · 第 37 / 44 题