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
JEAN M. NEIBARGER, STATE PRINTER
TOPEKA, KANSAS
1961
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 genusMyotis, the black myotis, Myotis nigricans, was known no farthernorth than Chiapas and Campeche. Collections of mammals madein recent years for the Museum of Natural History of The Universityof Kansas include specimens of M. nigricans from easternMexico as far north as Tamaulipas. Critical study of this newlyacquired material reveals that it pertains to an hitherto unnamedsubspecies 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 Andrés Tuxtla, 1000 ft., Veracruz;obtained on January 5, 1948, by Walter W. Dalquest, original No. 8444.
Range.—Tropical Life-zone of eastern México from southern Tamaulipasto central Chiapas.
Diagnosis.—Color black or dark brown, venter having brownish wash; sizelarge (see measurements); M1 and M2 quadrangular; prominent protostyleon P4; P2 and P3 in straight line; sagittal crest absent.
Comparison.—Color almost as in Myotis nigricans extremus, the subspeciesoccurring adjacent to dalquesti in Chiapas and Tabasco. From M. n. extremus,dalquesti differs as follows: larger; hypocone in M1 and M2 broadermaking posterointernal part less rounded; protostyle of P4 prominent insteadof absent; P3 in line with C and P2 instead of displaced lingually; sagittalcrest absent instead of present posteriorly. Myotis nigricans nigricans andM. n. dalquesti are of approximately equal size; otherwise they differ in thesame features as do extremus and dalquesti.
Measurements.—Average and extreme measurements of seven males fromthe type locality, followed by those of 19 females from 38 km. SE JesúsCarranza, and finally length of forearm and cranial measurements of eightfemale topotypes of M. n. extremus, are as follows: Total length, 80 (77-82),76 (72-80); length of tail, 32.8 (30-35), 33.5 (31-35); hind foot,