Vol. 1 issued also in Smithsonian Institution, miscellaneous collections, v. 25; Vol. 2 issued also as Smithsonian Institution, miscellaneous publication, no. 545.

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Details the evolutionary history of the desert woodrat complex (lepida group, genus Neotoma) of western North America. The analyses include standard multivariate morphometrics of museum specimens coupled with mitochondrial and nuclear DNA sequences and microsatellite loci. The work also traces the spatial and temporal diversification of this group of desert dwelling rodents, revising species boundaries and delineating subspecies considered valid.