University of Kansas Publications
Museum of Natural History
Volume 9, No. 3, pp. 81-84
December 10, 1955
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
BY
ROLLIN H. BAKER AND HOWARD J. STAINS
Long-eared bats obtained by field parties from the University ofKansas in the Mexican states of Coahuila, Nuevo León, and Tamaulipas,are found to belong to the species, Myotis evotis, but are notreferable to any named subspecies. They are named and describedas 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 northeasternMéxico 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; colordarker and richer; ears paler and contrasting less, in color, with pelage; skulllarger in all measurements taken except that of least interorbital constriction;forehead, when viewed laterally, rising more abruptly, because frontal region ismore inflated; teeth larger.
Remarks.—Myotis evotis auriculus, although no larger externallythan M. e. evotis, has a larger skull, which in lateral view has a moreabruptly rising forehead. The teeth, especially the first upper premolars,of auriculus are noticeably larger than those of evotis. Thefirst two lower premolars are sub-equal in auriculus whereas in evotisthe first lower premolar usually is larger. The mandible, in relationto 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 slightlypaler (upper parts (16) Ochraceous-Tawny; underparts (e) LightBuff) and have less abruptly rising foreheads than do the bats fromTamaulipas. In these features, the Coahuilan animals are somewhatintermediate between typical