Geographic Distribution of the Pocket Mouse, Perognathus fasciatus

In studying the kinds of pocket mice known from Nebraska, I examined thirteen specimens of P. fasciatus from the northwestern part of the state which did not agree satisfactorily with the descriptions of any known subspecies of fasciatus . This impelled me to examine material from the entire range of P. fasciatus . This examination revealed that: (1) Perognathus callistus Osgood, heretofore considered to be a full species, should be reduced to subspecific rank under P. fasciatus ; and (2) specimens from eastern Wyoming and adjacent parts of Montana, South Dakota and Nebraska represent an heretofore unrecognized subspecies. Further investigation, however, revealed that Perognathus flavescens olivaceogriseus Swenk, described from northwestern Nebraska (Swenk, 1940:6), is not flavescens but actually fasciatus . Since the specimens on which Swenk's description was based were taken within the range of this newly recognized subspecies, and since my examination of the holotype shows it to be of the species Perognathus fasciatus , the subspecific name olivaceogriseus is available.

The subspecies of P. fasciatus are most easily distinguished by color of pelage, in which there is a general cline from northeast (dark) to southwest (pale). Cranially, the subspecies are less distinct. The skulls of P. f. callistus can be distinguished from those of the other subspecies by several differences; however, among the other four subspecies, only minor cranial differences are evident. Individual variation was found to be greater than secondary sexual variation.
Fig. 1. Distribution of the five subspecies of Perognathus fasciatus . Solid symbols represent specimens examined; circled symbols represent type localities. Guide to subspecies 1. P. f. fasciatus 2. P. f. olivaceogriseus 3. P. f. infraluteus 4. P. f. litus 5. P. f. callistus
In connection with this study, grateful acknowledgment is made to the following persons for the loan of specimens in their care: Dr. H. E. Anthony, American Museum of Natural History (AMNH); Mr. Colin C. Sanborn, Chicago Natural History Museum (CNHM); Mr. Austin W. Cameron, National Museum of Canada (NMC); Miss Viola S. Schantz, Biological Surveys Collection, U. S. National Museum (USBS); Dr. Seth B. Benson, University of California Museum of Vertebrate Zoology (MVZ); Mr. J. E. Moore, Department of Zoology, University of Alberta (UADZ); Dr. William H. Burt, University of Michigan Museum of Zoology (MZ); Dr. Otis Wade, University of Nebraska Department of Zoology (UNDZ); Dr. C. Bertrand Schultz, University of Nebraska State Museum (NSM); and to those in charge of the collections of the Nebraska Game, Forestation and Parks Commission (NGFPC). Specimens from the Museum of Natural History, University of Kansas (KU), also have been used.