Four traplines were run from May 4-7, 1962, and from May 9-12, 1962. _P. maniculatus_ was taken but _P. truei_ was not present here in 1962, or in 1964 or 1965 when additional trapping was performed as a check on populations (Table 1). Other species trapped include the montane vole, long-tailed vole, and Colorado chipmunk. Mule deer and coyotes were abundant in the area. Striped whipsnakes, rattlesnakes and gopher snakes are known to occur in this vicinity (Douglas, 1966). _North End Wetherill Mesa_ In 1934 a widespread fire deforested large areas of pinyon-juniper woodland on the northern end of Wetherill Mesa. The current vegetation consists of shrubs with a dense ground cover of grasses. Many dead trees still remain on the ground, providing additional cover for wildlife. The trapping area was a wide, grassy meadow, three and a half miles south of the northern end of the mesa. A pronounced drainage runs through this area and empties into Rock Canyon. Four traplines were run parallel to each other. The first lines were established on May 23, 1962, and the second pair on June 3, 1962. Another pair of lines was run in a grassy area two miles south of the northern escarpment of Wetherill Mesa. This area was one and a half miles north of the above-mentioned area. These lines ran along the eastern side of a drainage leading into Long Canyon. The vegetation was essentially the same in both areas, and they will be considered together. The vegetation was composed predominantly of grasses. _Quercus gambelii_ and _Amelanchier utahensis_ were the codominant shrubs. _Artemisia tridentata_ and _Chrysothamnus depressus_ (dwarf rabbitbrush), were common. Plants in the two areas included the following: _Juniperus scopulorum_ _Symphoricarpos oreophilus_ _Artemisia ludoviciana_ _Sitanion hystrix_ _Stipa comata_ _Astragalus scopulorum_ _Artemisia tridentata_ _Chrysothamnus depressus_ _Helianthus annuus_ _Tetradymia canescens_ _Quercus gambelii_ _Bromus tectorum_ _Poa fendleriana_ _Lupinus caudatus_ _Yucca baccata_ _Sphaeralcea coccinea_ _Eriogonum umbellatum_ _Amelanchier utahensis_ _Fendlera rupicola_ _Lomatium pinatasectum_ Individuals of _P. maniculatus_ and of _Reithrodontomys megalotis_ were caught (Table 1). TABLE 1--Major Trapping Localities in Mesa Verde National Park, Colorado. Vegetational Key as Follows: 1) Pinyon-Juniper-Muttongrass 2) Pinyon-Juniper-Mixed Shrubs 3) Juniper-Pinyon-Bitterbrush 4) Juniper-Pinyon-Mountain Mahogany 5) Grassland with Mixed Shrubs 6) Big Sagebrush 7) Pinyon-Juniper-Big Sagebrush 8) Grassland. Column headings: A: Date B: No. trap nights C: _P. truei_ D: _P. man._ E: Type of vegetation