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. ”

“ Range.—Tropical Life-zone of eastern México 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 ”

“ N El Encino, 400 ft., Tamaulipas, are the northernmost representatives of the species and differ from the other specimens of dalquesti in shorter forearm, shorter maxillary tooth-row and lesser maxillary breadth.
Study in the laboratory was supported by Grant No. 56 G 103 from the National Science Foundation. Field work was supported by a grant from the Kansas University Endowment Association. We thank Dr. David H. Johnson for lending eight topotypes of M. n. extremus. Other specimens of extremus available to us are as follows: 1 mi. ”