University of Kansas Publications

Museum of Natural History

Volume 9, No. 3, pp. 81-84

December 10, 1955

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

Editors: E. Raymond Hall, Chairman, A. Byron Leonard, Robert W. Wilson

Volume 9, No. 3, pp. 81-84
Published December 10, 1955

University of Kansas
Lawrence, Kansas

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 (j14) 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).

Coahuilan specimens, although assigned to auriculus, are slightly paler (upper parts (16) Ochraceous-Tawny; underparts (e) Light Buff) and have less abruptly rising foreheads than do the bats from Tamaulipas. In these features, the Coahuilan animals are somewhat intermediate between typical auriculus and evotis. The bat from Nuevo