The Project Gutenberg eBook of A New Subspecies of Pocket Mouse from Kansas, by E. Raymond Hall.

University of Kansas Publications
Museum of Natural History

Volume 7, No. 11, pp. 587-590
November 15, 1954

A New Subspecies of Pocket Mouse
from Kansas

University of Kansas Publications, Museum of Natural History

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

Volume 7, No. 11, pp. 587-590
Published November 15, 1954

University of Kansas
Lawrence, Kansas

PRINTED BY
FERD VOILAND, JR., STATE PRINTER
TOPEKA, KANSAS
1954

25-5678

A New Subspecies of Pocket Mouse
from Kansas

When preparing distribution maps for a revised list of the Mammals of Kansas it became apparent to me that pocket mice of the species Perognathus flavescens from south-central Kansas and adjoining parts of Oklahoma were without a subspecific name. The new subspecies is named and described below.

Holotype. —Female, subadult (P4 moderately worn), skin with skull, No. 13045, Univ. Kansas Mus. Nat. Hist.; 4-1/2 mi. NE Danville, Harper Co., Kansas; December 1, 1939; obtained by Sam Tihen; original No. 99 of J. A. Tihen.

Range. —South-central Kansas south at least into Dewey County, Oklahoma.

Diagnosis. —Size small; upper parts Ochraceous-Buff (capitalized color terms after Ridgway, Color Standards and Color Nomenclature, Washington, D. C., 1912) heavily suffused with black; postauricular patches and a band 8 mm wide on each side Ochraceous-Buff; subauricular spot, underparts, and forefeet white; hind feet slightly dusky; tail brownish above and white below. Skull small; tympanic bullae small; rostrum wide; skull indistinguishable from that of P. f. flavescens from the same latitude in western Kansas.

Comparisons. — Perognathus flavescens cockrumi averages approximately 12 per cent smaller in linear measurements than the more northern Perognathus flavescens perniger Osgood (from Knox, Stanton and Cumming counties, Nebraska) but color of upper parts is essentially the same. From the more western Perognathus flavescens flavescens Merriam (from Seward, Hamilton and Morton counties, Kansas), cockrumi differs in being darker in all parts of the pelage except on the underparts which are white in both subspecies; the parts of the hairs that are Ochraceous-Buff in cockrumi are Light Ochraceous-Buff in flavescens ; the back of cockrumi is blackish instead of yellowish. From the more southern Perognathus flavescens copei Rhoads (topotypes examined but not at hand as I write), cockrumi differs in duller more blackish (less bright and less reddish) upper parts. From Perognathus merriami gilvus , of more southern distribution, the new subspecies differs in much smaller tympanic bullae and wider rostrum.

Measurements. —The type, a male (35331/47596 U.S.B.S., from Cairo, Kansas, showing some wear on P4), and another male (60165 K. U., from Barber Co., Kansas, showing much wear on P4) measure, respectively: Total length, 114, 120, 124; tail, 51, 55, 58; hind foot, 17, 17, 18; occipitonasal length,——, 21.0, 21.6; condylobasal length (condyles to anterior end of premaxillae), 18.5, 18.6, 19.3; frontonasal length,——, 14.1, 14.3; mastoidal breadth, 10.5, 11.2, 11.2; length of bulla, 6.8, 7.1, 6.8; interorbital breadth, 4.7, [Pg 590] 4.8, 5.1; alveolar length of upper molariform tooth-row, 3.1, 3.1, 3.0; interparietal breadth, 4.3. 4.6, 4.7.

Remarks. —The subspecific name cockrumi is proposed in recognition of Dr. E. Lendell Cockrum's important contribution to our knowledge of the mammals of Kansas. Dr. W. Frank Blair recently suggested to me that the two specimens examined by him from Kansas (the one from Ellsworth County and the one here designated as holotype) should not be referred to Perognathus flavescens copei Rhoads, as Cockrum (Univ. Kansas Publ., Mus. Nat. Hist., 7:146, August 25, 1952) had done, because copei is paler, instead of darker, than P. f. flavescens . It was Dr. Blair's suggestion which lead me to realize that the subspecies in south-central Kansas lacked a name.

Through the courtesy of Miss Viola S. Schantz I have examined three of the four specimens from Cairo, Kansas, that Osgood (N. Amer. Fauna, 18:21, September 20, 1900) referred to Perognathus flavescens before any subspecies of that species had been recognized. The specimens from Cairo are intermediate in color, as they are also in geographic position, between P. f. flavescens from western Kansas and P. f. cockrumi from south-central Kansas but show more resemblance to the latter and therefore are referred to P. f. cockrumi . The specimens, excepting the three from Cairo, are in the Museum of Natural History at the University of Kansas.

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The Project Gutenberg eBook of A New Subspecies of Pocket Mouse from Kansas

A New Subspecies of Pocket Mouse from Kansas

A New Subspecies of Pocket Mouse from Kansas

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A New Subspecies of Pocket Mouse
from Kansas

A New Subspecies of Pocket Mouse
from Kansas