nd Mesa to be evaluated critically are _Myotis
evotis_, _Myotis volans_, _Spermophilus variegatus_, _Eutamias
quadrivittatus_, _Castor canadensis_, _Ondatra zibethicus_, _Erethizon
dorsatum_, _Mustela frenata_, _Taxidea taxus_, _Mephitis mephitis_, and
_Odocoileus hemionus_. Three other wide-spread species are
differentiated into lowland and highland subspecies; two of these
species, _Eutamias minimus_ and _Peromyscus maniculatus_, are
represented on the Grand Mesa by the darker subspecies of the
mountains. The third species, _Neotoma cinerea_, is represented by two
individuals from below the actual rim of the mesa; they are intergrades
between the lowland and highland subspecies.

Species of southern distribution, that are dependent at the latitude of
Colorado upon the habitat provided by areas of lower altitudes, and
that are here in Colorado near their northern limit comprise a third
category that is not represented in the list of mammals from the Grand
Mesa although such characteristic species as _Ammospermophilus
leucurus_, _Perognathus apache_, and _Dipodomys ordii_ occur as near as
Grand Junction.

Approximately 55 per cent of the species of the mammalian fauna are
boreal; no species of Sonoran affinities finds haven on the Grand Mesa.

Transmitted January 22, 1959.

27-7472

* * * * *

Transcriber's Notes:

Italicized text is shown within _underscores_.

Bold italicized text is shown within =_equal signs and underscores_=.

Page 407: Rejoined the remainder of the last paragraph, originally
found on page 409.

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Sydney Anderson

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