Read "A New Subspecies of Ground Squirrel from Tamaulipas, Mexico" by Ticul Alvarez online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
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 Mexico, provide the first specimens from the mainland of Tamaulipas, and represent a new subspecies that is named and described below.