WIDE-SPREAD.--Species in this category are those that are widely distributed in the western United States and that occur in Colorado in both the mountains and the lower more arid intermontane areas. Some of these species are differentiated into subspecies, one of which inhabits the mountains and another the lowlands. Wide-spread species that do not have subspecies in the lowlands different than the subspecies in the mountains or that are represented by too little material from the Grand 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.