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E. RAYMOND HALL AND TICUL ALVAREZ
pubblicato da
Charles Fred
In 1928 when Miller and Allen (Bull. U. S. Nat. Mus., 144) published their revisionary account of American bats of the genus _Myotis_, the black myotis, _Myotis nigricans_, was known no farther north than Chiapas and Campeche. Collections of mammals made in recent years for the Museum of Natural History of The University of Kansas include specimens of _M. nigricans_ from eastern Mexico as far north as Tamaulipas. Critical study of this newly acquired material reveals that it pertains to an hitherto unnamed subspecies that may be named and described as follows:
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