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Section 779.20 (c) Continued. • bushy-tailed woodrat (Neotoma cinerea), long-tailed vole (Microtus longicaudus), and muskrat (Ondatra zibethicus). Additional small mammal species were identified in the area by Dames and Ptoore (1975). These included: Colorado chipmunk (Eutamias quadrivittatus), white-tailed prairie dog (Cyr.omys leucurus), southern red-backed vole (Clethrinomys gapperi), montane vole (Microtus montanus), and western jumping mouse (Zapus princeps). The ubiquitous deer mouse was found over the entire study area during the 1978 investigations. It was most prevalent in the mountain shrub habitat and least abundant in the wet meadow. Least chipmunk were found most frequently in the mountain shrub and were not trapped in either the wet meadow or sagebrush habitat. Richardson's ground squirrels were most abrnaant in wet meadow and semi-open sagebrush communities and rocky, mountain shrub. Golden-mantled ground squirrels were most often observed in mountain shrub, while • northern pocket gopher sign was located in areas of deep loamy soils such as in the aspen community. Comparison of the 1975 and 1979 Small Mammal Trapping data indicate that in 1975, six species of small mammals were live trapped while in 1979 only two species were trapped. The discrepancies obtained between these two studies can be attributed largely to the different sampling methodology employed. The snap traps used in the study were often sprung without catching the animal. The species diversity obtained from the 1979 trapping data tend to over-emphasize the abundance of smaller species in relationship to the larger species. A better index for abundance would be to compare the species actually trapped. In 1975, 432 trap nights yielded 14 least chipmunks and 43 deer mice. During the 1979 season, 600 trap nights yielded 28 least chipmunks and 124 deer mice. If these data can be used for relative abundance, in 1975, 3.2 percent of the traps caught least chipmunks while in 1979, 4.7 percent caught least chipmunks. In • 1975, trapping efficiency of deer mice was 9.9 percent, while in 779-156