This file was derived from scanned images. With the exception oftwo typographical errors that were corrected, removal of an annotation toFigure 1, and rejoining the text which was split by the tables in the printedversion, the original text and copies of the included illustrations are presented.
Typographical Errors Corrected:
Page 603, Paragraph 2: subpecies => subspecies
Page 607, Paragraph 2: Aquanaval => Aguanaval
Museum of Natural History
March 15, 1955
ROBERT J. RUSSELL AND ROLLIN H. BAKER
University of Kansas
Lawrence
1955
Editors: E. Raymond Hall, Chairman, A. Byron Leonard, Robert W. Wilson
Published March 15, 1955
Lawrence, Kansas
FERD VOILAND, JR., STATE PRINTER
TOPEKA, KANSAS
1955
25-5679
The plateau pocket gopher, Cratogeomys castanops, inhabits openlands from southeastern Colorado southward onto the MexicanPlateau as far south as southern San Luis Potosí and southeasternZacatecas and southeastward to the Coastal Plain of northern Tamaulipas.This species occurs at elevations from as low as 26 feet atMatamoras in Tamaulipas to as high as 8700 feet in valleys of south-easternCoahuila. In 1934, Nelson and Goldman (Proc. Biol. Soc.Washington, 47:135-154, June 13, 1934) revised the genusCratogeomys and decided that six subspecies of C. castanops occurredin Coahuila. In the present account, we describe fourpreviously unknown subspecies from Coahuila, exclude from thestate two others recorded from there by Nelson and