Produced by Chris Curnow, Joseph Cooper, Stephen Blundell and the Online Distributed Proofreading Team at https://www.pgdp.net UNIVERSITY OF KANSAS PUBLICATIONS MUSEUM OF NATURAL HISTORY Volume 14, No. 4, pp. 69-72, 1 fig. December 29, 1961 A New Subspecies of the Black Myotis (Bat) From Eastern Mexico BY E. RAYMOND HALL AND TICUL ALVAREZ UNIVERSITY OF KANSAS LAWRENCE 1961 UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY Editors: E. Raymond Hall, Chairman, Henry S. Fitch, Theodore H. Eaton, Jr. Volume 14, No. 4, pp. 69-72, 1 fig. Published December 29, 1961 UNIVERSITY OF KANSAS Lawrence, Kansas PRINTED BY JEAN M. NEIBARGER, STATE PRINTER TOPEKA, KANSAS 1961 [Device] 28-8477 A New Subspecies of the Black Myotis (Bat) From Eastern Mexico BY E. RAYMOND HALL AND TICUL ALVAREZ 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: MYOTIS NIGRICANS DALQUESTI new subspecies _Type._--Male, adult, skin and skull, No. 23839 Museum of Natural History, University of Kansas; from 3 km. E of San Andres Tuxtla, 1000 ft., Veracruz; obtained on January 5, 1948, by Walter W. Dalquest, original No. 8444. _Range._--Tropical Life-zone of eastern Mexico from southern Tamaulipas to central Chiapas. _Diagnosis._--Color black or dark brown, venter having brownish wash; size large (see measurements); M1 and M2 quadrangular; prominent protostyle on P4; P2 and P3 in straight line; sagittal crest absent. _Comparison._--Color almost as in _Myotis nigricans extremus_, the subspecies occurring adjacent to _dalquesti_ in Chiapas and Tabasco. From _M. n. extremus_, _dalquesti_ differs as follows: larger; hypocone in M1 and M2 broader making posterointernal part less rounded; protostyle of P4 prominent instead of absent; P3 in line with C and P2 instead of displaced lingually; sagittal crest absent instead of present posteriorly. _Myotis nigricans nigricans_ and _M. n. dalquesti_ are of approximately equal size; otherwise they differ in the same features as do _extremus_ and _dalquesti_.