ical difference between
two or more samples. Whenever eight or more specimens from one
locality were available, the mean, range, standard deviation,
standard error of the mean, and coefficient of variability were
calculated.

Only adult specimens were used in comparison. "Aging" of specimens
is discussed on page 587 of this paper.

The geographic range of each species and subspecies is not
described in writing, for, the localities are plotted on maps along
with the geographic range of each subspecies, and under "specimens
examined" the locality of each specimen or series of specimens is
listed.

In the synonymy of each subspecies there appears, first the first
usage of a name, second the first usage of the name combination now
employed, and third, pure synonyms.

A total of 757 specimens of chipmunks are listed as examined in the
course of preparing this report. Additional specimens were less
carefully examined in the Biological Surveys Collection in
Washington, D.C. Specimens used in my study, unless otherwise
specified, are in the Museum of Natural History, University of
Kansas. The symbols representing the collections containing
specimens studied are as follows:

BS--United States Biological Surveys Collection.
FC--Collection of James S. Findley.
MM--Museum of Zoology, University of Michigan.
NM--United States National Museum.
KU--Museum of Natural History, University of Kansas.

I am grateful to Professor E. Raymond Hall for guidance in my study
and thank Doctors Robert W. Wilson, E. Lendell Cockrum, Keith R.
Kelson, A. Byron Leonard, Rollin H. Baker, and others at the Museum
of Natural History and Department of Zoology, University of Kansas,
for encouragement and advice. My wife, Alice M. White, made the
illustrations and helped me in many ways.

For permission to borrow and to study specimens, I thank Dr. W. H.
Burt of the Museum of Zoology, University of Michigan, Miss Viola
S. Schantz of the United States Fish and Wildlife Service, Mr.
Colin C. Sanborn of the Chicago Natural History Museum, and Mr.
James S. Findley.

Assistance with field work is acknowledged from the Kansas
University Endowment Association, the National Science Foundation
and the United States Navy, Office of Naval Research, through
contract No. NR161