listed above exceeds the maximum of the corresponding dimension in nivalis.

Remarks.—Leptonycteris nivalis longala inhabits the northeastern end of the Mexican Plateau. Bats from Brewster County, Texas, referred to longala, average slightly larger in all measurements taken than do specimens from southern Coahuila. Specimens from Cerro Potosí, Municipio de Galeana, Nuevo León, also are referred to longala on the basis of the length of their third fingers. Like the specimens from Texas, these bats possess longer forearms, on the average, than do bats from Coahuila.

Topotypes of L. n. nivalis from Mount Orizaba were not available, but 111 specimens referable to the subspecies nivalis were examined. These specimens were from the following places: Sonora: ¼ mi. W Aduana, 1600 ft., 4 specimens. Jalisco: Hda. San Martín, 5000 ft., 18 mi. W Chapala, 3; 11 mi. W Chapala, 5000 ft., 1; 5 mi. W Chapala, 5000 ft., 58; 8 mi. NE Ocotlán, 5100 ft., 1. Hidalgo: 6 km. NW Tasquillo, 500 ft., 1. Veracruz: 3 km. W Boca del Río, 25 ft., 22. Distrito Federal: Chicomostoc, Cerro Teutli, 2⅖ mi. NNW Milpa Alta, 2620 ft., 18. Oaxaca: Cuicatlán, 600 ft., 1; 3 km. WNW Dominguillo, 730 ft., 2. All these specimens are in the Museum of Natural History at the University of Kansas. Little discernible geographic variation was found in these specimens of L. n. nivalis. No specimens could, with certainty, be classed as intergrades between longala and nivalis, but it is thought that intergrades will be found in western San Luis Potosí or in Zacatecas or in both states. Dalquest (Mammals of the Mexican State of San Luis Potosí, Louisiana State Univ. Studies, Biol. Sci. Ser. No. 1, pp. 27-28, 1953) refers five specimens taken from Hda. Capulín, southeastern San Luis Potosí, to L. n. nivalis. Measurements by Dalquest are in accordance with other measurements of L. n. nivalis listed above.

The name L. n. yerbabuenae Martinez and Villa, was based on specimens from Yerbabuena in the state of Guerrero. The specimens, including the holotype, on which this name was based have been destroyed. Luis de la Torre (Fieldiana, 37:698, 1955) examined a topotype of yerbabuenae and was unable to distinguish this specimen from a topotype of nivalis from Orizaba. Davis and Russell (Jour. Mamm., 33:236, 1952) identified as L. n. nivalis one bat from Morelos, taken approximately 32 miles NE of the type locality of yerbabuenae, noting that its third finger was much shorter than in specimens from the Big Bend of Texas. I judge L. n. yerbabuenae to be a synonym of nivalis as does de la Torre.

Acknowledgment is made to Dr. W. B. Davis of the Agricultural and Mechanical College of Texas and Mr. Colin C. Sanborn of the Chicago Natural History Museum for loan of comparative material. I am grateful also to the Kansas University Endowment Association and National Science Foundation for support of field work, and to Dr. Rollin H. Baker for guidance in my study.

Measurements.—The following measurements in millimeters include those of the type, and the average and extreme measurements of the type and 22 adult topotypes: total length, 79, 79 (73-86); length of hind foot, 16, 16 (14-17); length of ear, 16, 16.5 (15-17); length of forearm, 50.0, 50.6 (47.3-55.0); greatest length of skull, 28.1, 27.5 (26.1-29.0); zygomatic breadth, 9.2, 9.6 (8.6-11.2); interorbital constriction, 4.6, 4.8 (4.1-5.4); mastoidal breadth, 11.7, 11.6 (11.0-12.1); breadth of braincase, 10.5, 10.7 (10.1-11.2); greatest height of skull, 9.8, 10.0 (9.6-10.5); alveolar length of maxillary tooth-row, 8.9, 9.1 (8.5-9.6); and length of third finger, 110.8, 111.3 (106.9-116.1).

Specimens of L. n. longala examined.—Total number, 109, as follows: Texas: cave W