nis_ 596
_E. m. silvaticus_ 597
_E. m. operarius_ 598

_Eutamias amoenus_ 602
_E. a. luteiventris_ 602

_Eutamias dorsalis_ 603
_E. d. utahensis_ 604

_Eutamias umbrinus_ 606
_E. u. umbrinus_ 606
_E. u. fremonti_ 607
_E. u. montanus_ 608

Review and Conclusions 609

Literature Cited 610

FIGURES

Figure 1. Subspecies of _Eutamias minimus_ 590

Figure 2. _Eutamias amoenus_ and _Eutamias dorsalis_ 604

Figure 3. Subspecies of _Eutamias umbrinus_ 605

PURPOSE

The purpose of the following account is to: (1) Show what kinds of
chipmunks occur in Wyoming; (2) point out the interrelationships
between these kinds; and (3) account, where possible, for the present
distribution of these animals in Wyoming.

METHODS, MATERIALS, AND ACKNOWLEDGMENTS

Capitalized color terms in the following accounts are of Ridgway,
"Color Standards and Color Nomenclature," Washington, D.C., 1912.

The measurements of the skull that were used in this study were
made as shown in White (1953:566, fig. 1). These are: Greatest
length of skull, zygomatic breadth, cranial breadth, length of
nasals, length of lower tooth-row, condylo-alveolar length of
mandible, and inner mandibular length.

Of the external measurements, only the total length and the length
of the tail are recorded in table 1. Some field collectors measured
the ear from the notch and others from the crown; most collectors
measured the length of the hindfoot to the nearest millimeter
rather than in tenths of a millimeter as would have been desirable.
Consequently, I decided against using the length of the ear and
hindfoot in this report.

When the word "significantly" is used in comparisons, it is meant
to show that there is a significant statist