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Geographic Distribution of the Pocket Mouse, Perognathus fasciatus   By: (1929-1992)

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Geographic Distribution of the Pocket Mouse, Perognathus fasciatus

BY

J. KNOX JONES, JR.

University of Kansas Publications Museum of Natural History

Volume 5, No. 29, pp. 515 526, 7 figures in text August 1, 1953

University of Kansas LAWRENCE 1953

UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY

Editors: E. Raymond Hall, Chairman, A. Byron Leonard, Robert W. Wilson

Volume 5, No. 29, pp. 515 526, 7 figures in text August 1, 1953

UNIVERSITY OF KANSAS Lawrence 1953

PRINTED BY FERD VOILAND, JR., STATE PRINTER TOPEKA. KANSAS 1953

24 7673

Geographic Distribution of the Pocket Mouse, Perognathus fasciatus

BY

J. KNOX JONES, JR.

In his "Revision of the pocket mice of the genus Perognathus," Osgood (1900:18 20) reviewed the distribution, as then known, of Perognathus fasciatus and recognized two geographic races Perognathus fasciatus [ fasciatus ] Wied Neuwied in eastern Montana and Wyoming and adjacent parts of North and South Dakota, and Perognathus fasciatus infraluteus Thomas, known only from the type locality at Loveland, Larimer County, Colorado. Later, Cary (1911:61) described Perognathus fasciatus litus as a pale subspecies occurring in the lower Sweetwater Valley and adjacent parts of the Red Desert of south central Wyoming. After 1911 no important taxonomic contributions dealing with Perognathus fasciatus appeared.

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.

[Illustration: 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... Continue reading book >>




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