León, in both color and degree of slope of forehead, is intermediate between those from Coahuila and those from Tamaulipas.

A bat from Perote, Veracruz, identified as Myotis evotis chrysonotus (J. A. Allen) [=M. e. evotis] by Miller and Allen (U. S. Nat. Mus., Bull. 144:118 and 120-121, May 25, 1928) is here assigned to M. e. auriculus. Measurements given by these authors indicate that this bat has a large skull, which is characteristic of this subspecies. Another specimen, similarly assigned by these authors and from the San Luis Mountains in northwestern Chihuahua, seems to be M. e. evotis, although the published measurements (loc. cit.) show that this bat tends toward auriculus in size of skull and mandible.

All specimens were taken in mist nets stretched over water. Those from Coahuila were snared over a concrete water tank situated near the base of low hills in mixed mesquite and chaparral. In Nuevo León, one bat was netted over a small pond around which grew some low trees in an intermontane valley in the Sierra Madre Oriental. In Tamaulipas two bats were caught in a mist net stretched across a narrow, brush-bordered arroyo in the Sierra de Tamaulipas. One adult male weighed 7.0 grams; average and extreme weights of 7 adult, non-pregnant females were 6.8 (5.2-8.0). Females taken on March 25 and 26 were not pregnant; one obtained on June 20 was lactating. Funds for financing field work were made available by the Kansas University Endowment Association and the National Science Foundation.

Measurements.—Measurements, in millimeters, of the holotype and another female (No. 55111 KU) from the type locality and 3 females (Nos. 44726, 44729-30 KU) from Coahuila, respectively, are: total length, 94, 93, 97, 86, 96; length of tail vertebrae, 43, 42, 41, 39, 45; length of hind foot, 9.5, 9, 10, 10, 8; height of ear from notch, 20, 20, 20, 18, 20; length of forearm, 37.9, 38.4, 40.2, 37.3, 38.5; greatest length of skull, 16.1, 16.4, 16.2, 15.8, 16.1; condylobasal length, 15.4, 15.4, 15.6, 15.0, 15.4; zygomatic breadth, 9.7, 9.9, 10.1, 9.4, 9.9; least interorbital constriction, 3.9, 3.8, 3.9, 3.7, 3.7; breadth of braincase, 7.5, 7.6, 7.5, 7.5, 7.6; occipital depth, 5.9, 5.9, 5.5, 5.7, 5.6; palatal length, 8.5, 8.7, 8.7, 8.7, 8.9; mastoid breadth, 8.2, 8.4, 8.3, 8.2, 8.3; breadth across third upper molars, 6.1, 6.2, 6.3, 6.1, 6.1; length of maxillary tooth-row, 6.5, 6.5, 6.7, 6.6, 6.6; length of mandible, 11.5, 11.8, 11.9, 11.2, 11.7; length of mandibular tooth-row, 8.0, 8.0, 8.1, 8.1, 8.1.

Specimens examined.—Total, 8, all in the University of Kansas Museum of Natural History. Coahuila: 4 mi. W Hacienda La Mariposa, 2300 ft., 5 (2 alcoholics). Nuevo León: Iturbide, 5000 ft., Sierra Madre Oriental, 1. Tamaulipas: 10 mi. W and 2 mi. S Piedra, 1200 ft., Sierra de Tamaulipas, 2.

Transmitted April 16, 1955.