Abstract
The Mexican vole, Microtus mexicanus , and the least shrew, Cryptotis parva , were both found in Pleistocene deposits (10,730 ± 150 B.P.) at Dry Cave, New Mexico. Present day climatic parameters for the two species were assessed in an attempt to delineate pluvial climatic conditions for the southwestern United States. The ranges of the two species most closely approach each other, geographically and topographically, in Mexico. Competition may prevent the two species from occurring together in Mexico and the United States. It is hypothesized that pluvial conditions were more temperate as well as more mesic, because such conditions characterize those areas of Mexico where the ranges of the two species now approach one another.
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