University of Kansas Publications
Museum of Natural History
Volume 5, No. 19, pp. 259-262
April 10, 1952
University of Kansas
LAWRENCE
1952
University of Kansas Publications, Museum of Natural History
Editors: E. Raymond Hall, Chairman, A. Byron Leonard,Edward H. Taylor, Robert W. Wilson
Volume 5, No. 19, pp. 259-262
April 10, 1952
University of Kansas
Lawrence, Kansas
PRINTED BY
FERD VOILAND, JR., STATE PRINTER
TOPEKA, KANSAS
1952
by
JOHN A. WHITE
Study of the chipmunks from the eastern Rocky Mountains andGreat Plains reveals that the chipmunks from northeastern Wyomingand from South Dakota which Howell (N. Amer. Fauna, 52:55,November 30, 1929) referred to Eutamias minimus borealis actuallybelong to a heretofore unnamed subspecies which may be namedand described as follows:
Eutamias minimus silvaticus new subspecies
Type.—Female, adult, skull and skin, No. 20050 Mus. Nat. Hist., Univ.Kansas; from 3 mi. NW Sundance, 5900 ft., Crook County, Wyoming; obtainedon July 4, 1947, by H. W. Setzer; original No. 1692.
Range.—Bear Lodge Mountains in northeastern Wyoming and the BlackHills of South Dakota.
Diagnosis.—Size large (see measurements); general tone of upper parts drab;sides Ochraceous Buff (capitalized terms are of Ridgway, Color Standards andColor Nomenclature, Washington, D. C., 1912); lateral stripes Fuscus Blackwashed with Ochraceous Tawny; ventral side of tail near (14' h) OchraceousOrange and fringed with black.
Comparisons.—From Eutamias minimus pallidus (specimens from Buffalo inJohnson County, Ivy Creek, Rockypoint, Middle Butte, and South Butte inCampbell County, all in Wyoming, and Harrison, Sioux County, Nebraska),the subspecies to the southward, westward, and northward, E. m. silvaticusdiffers in: General tone of upper parts markedly darker, more reddish and lessgrayish; dorsal stripes darker; crown markedly darker. External measurements,and measurements and characters of the skull of the two subspecies, do notdiffer significantly. Unless otherwise specified all comparative material is in theMuseum of Natural History of the University of Kansas.
From Eutamias minimus cacodemus (topotypes in the United States NationalMuseum), the subspecies to the southeastward, E. m. silvaticus differs in thesame manner in which it differs from E. m. pallidus, but the degree of differenceis greater because E. m. cacodemus is even paler than E. m. pallidus.
From Eutamias minimus confinis (specimens from 17½ mi. E and 4½ mi. SShell, 8500 ft., Big Horn County, Wyoming), E. m. silvaticus differs in: Generaltone of upper parts darker, more reddish and less grayish; sides of rum