Produced by Chris Curnow, Joseph Cooper and the Online Distributed Proofreading Team at http://www.pgdp.net A New Long-eared Myotis (Myotis evotis) from Northeastern México BY ROLLIN H. BAKER AND HOWARD J. STAINS =University of Kansas= =Lawrence= 1955 =University of Kansas Publications= =Museum of Natural History= Vol. 9, No. 3, pp. 81-84 December 10, 1955 Editors: E. Raymond Hall, Chairman, A. Byron Leonard, Robert W. Wilson PRINTED BY FERD VOILAND, JR., STATE PRINTER TOPEKA, KANSAS 1955 25-8617 A New Long-eared Myotis (Myotis Evotis) From Northeastern México BY ROLLIN H. BAKER AND HOWARD J. STAINS Long-eared bats obtained by field parties from the University of Kansas in the Mexican states of Coahuila, Nuevo León, and Tamaulipas, are found to belong to the species, _Myotis evotis_, but are not referable to any named subspecies. They are named and described as follows: #Myotis evotis auriculus# new subspecies _Type._--Female, adult, skin and skull; No. 55110, Univ. Kansas Mus. Nat. Hist.; 10 mi. W and 2 mi. S Piedra, 1200 ft., Sierra de Tamaulipas, Tamaulipas; 9 June 1953; obtained by Gerd H. Heinrich, original number 7061. _Distribution._--Coastal foothills and adjacent mountains of northeastern México from central Coahuila south and east to central Veracruz. _Diagnosis._--Size medium (see measurements), ears small for the species; color dark, upper parts (_j_14) Ochraceous-Tawny (color terms are after Ridgway, Color Standards and Color Nomenclature, Washington, D. C., 1912), underparts Warm Buff, ears pale; skull large, teeth large, mandible long. _Comparison._--From _Myotis evotis evotis_ (H. Allen), from Colorado, Wyoming, and Montana, _M. e. auriculus_ differs in: Ears averaging shorter; color darker and richer; ears paler and contrasting less, in color, with pelage; skull larger in all measurements taken except that of least interorbital constriction; forehead, when viewed laterally, rising more abruptly, because frontal region is more inflated; teeth larger. _Remarks._--_Myotis evotis auriculus_, although no larger externally than _M. e. evotis_, has a larger skull, which in lateral view has a more abruptly rising forehead. The teeth, especially the first upper premolars, of _auriculus_ are noticeably larger than those of _evotis_. The first two lower premolars are sub-equal in _auriculus_ whereas in _evotis_ the first lower premolar usually is larger. The mandible, in relation to the greatest length of the skull, is longer in _auriculus_ (ratio, 71-74) than in _evotis_ (ratio, 67-71).