Comments on the Taxonomy and Geographic Distribution of North American Microtines BY E. RAYMOND HALL and E. LENDELL COCKRUM In preparing maps showing the geographic distribution of North American microtines, conflicting statements in the literature and identifications that, if accepted, would result in improbable geographic ranges have led to the examination of pertinent specimens with the results given below. The studies here reported upon were aided by a contract between the Office of Naval Re