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ABSTRACT
The Hemphillian Land Mammal Age was defined by Wood et al. (1941) on local faunas from the Coffee Ranch of Hemphill County and from near Higgins, in Lipscomb County, Texas. Both large and small mammals of the Coffee Ranch are known but only a tentative list of the megafauna of Higgins has been published (Schultz, 1977), and no small mammals have been reported. Small mammal fossils collected at the Higgins B Quarry in 1984 include eight taxa, two of which are new (the chiropteran Pizonyx wheeleri, sp. nov., and the geomyid rodent Pliosaccomys higginsensis, sp. nov.). Comparisons of both large and small mammals of Coffee Ranch and Higgins local faunas show few genera and few species in common. The Higgins local fauna is early Hemphillian, with numerous Clarendonian elements. The Coffee Ranch local fauna is early late Hemphillian. It is urged that the type locality and type local fauna of the Hemphillian Land Mammal Age be restricted to the Coffee Ranch alone.
New material from the Coffee Ranch includes specimens of Cupidinimus sp. and permits better characterization of the eomyid, Comancheomys rogersi.