Produced by Chris Curnow, Dianna Adair, Joseph Cooper and the Online Distributed Proofreading Team at http://www.pgdp.net UNIVERSITY OF KANSAS PUBLICATIONS MUSEUM OF NATURAL HISTORY Volume 14, No. 8, pp. 121-124 March 7, 1962 A New Subspecies of Ground Squirrel (Spermophilus spilosoma) from Tamaulipas, Mexico BY TICUL ALVAREZ UNIVERSITY OF KANSAS LAWRENCE 1962 UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY Editors: E. Raymond Hall, Chairman, Henry S. Fitch, Theodore H. Eaton, Jr. =Volume 14, No. 8, pp. 121-124 Published March 7, 1962= UNIVERSITY OF KANSAS Lawrence, Kansas PRINTED BY JEAN M. NEIBARGER, STATE PRINTER TOPEKA, KANSAS 1962 29-1505 A New Subspecies of Ground Squirrel (Spermophilus spilosoma) from Tamaulipas, Mexico BY TICUL ALVAREZ When A. H. Howell (N. Amer. Fauna, 56:1-256, 1938) revised the North American ground squirrels, he had no specimens of the spotted ground squirrel, _Spermophilus spilosoma_, from Tamaulipas. Thirteen years later, Hall (Univ. Kansas Publ., Mus. Nat. Hist., 5:38, 1951) listed the species for the first time from the state when he recorded as _S. s. annectens_ 13 specimens from the barrier beach 88-89 miles south and 10 miles west of Matamoros. In 1953, Mr. Gerd Heinrich collected 10 individuals of _S. spilosoma_ from the coastal plain of eastern Tamaulipas that extend southward the known range of the species on the east coast of México, provide the first specimens from the mainland of Tamaulipas, and represent a new subspecies that is named and described below. =Spermophilus spilosoma oricolus= new subspecies _Type._--Female, adult, skin and skull, No. 55497 Museum of Natural History, The University of Kansas; from one mile east of La Pesca, Tamaulipas, México; obtained on May 27, 1953, by Gerd Heinrich, original number 6933. _Diagnosis._--Size medium for species (see measurements); general color cinnamon buff, almost pure on dorsal surface of hind foot and dorsal and ventral midline of tail; spots well marked; postorbital constriction narrow; auditory bullae small; viewed from front, lower border of maxillary plate forming continuously concave line with jugal; zygomatic process of maxillary narrow, having anterior border concave.