1902. Chilonycteris mexicana Miller, Proc. Acad. Nat. Sci. Philadelphia, 54:401, September 12, type from San Blas, Nayarit.
Distribution in Tamaulipas.—Southern part of state in areas of tropical forest.
Most individuals of this species were taken in mist nets. Northwest of El Encino for example, bats were collected from a net placed in "a strategic position across a narrow opening" (Schaldach, fieldnotes) in a cave near the headwaters of the Río Sabinas; along the same river at Rancho Pano Ayuctle some were taken in a net stretched across a little creek (arroyo). In the cave near El Encino the collector (Schaldach) estimated the population of P. rubiginosus at between two and three hundred; at Ojo de Agua this bat was found in the deepest part of a cave in association with Myotis nigricans.
Two June-taken females from the Sierra de Tamaulipas were lactating, and weighed 17 and 18 grams.
The generic name Pteronotus is employed instead of Chilonycteris following Burt and Stirton (1961:24-25). The specific name rubiginosus is used in accordance with de la Torre (1955:696). Tamaulipan specimens are assigned to P. r. mexicana because they do not differ from specimens of that subspecies from Nayarit, except that the coloration of Tamaulipan specimens averages slightly darker in both color phases.
Specimens of this subspecies from the Sierra de Tamaulipas, previously recorded by Anderson (1956:349), are the northernmost reported in eastern México.
Records of occurrence.—Specimens examined, 31: Sierra de Tamaulipas, 2 mi. S, 10 mi. W Piedra, 1200 ft., 1; Sierra de Tamaulipas, 3 mi. S, 10 mi. W Piedra, 1400 ft., 3; Rancho Pano Ayuctle, 25 mi. N El Mante, 3 mi. W Pan-American Highway, 300 ft., 3; Ojo de Agua, 20 mi. N El Mante, and 3 km. W Pan-American Highway, 300 ft., 2; 10 km. N, 8 km. W El Encino, 400 ft., 22.
Additional records (Goodwin, 1954:4): Aserradero del Paraiso; El Pachón.
Pteronotus davyi fulvus (Thomas)
Davy's Naked-backed Bat
1892. Chilonycteris davyi fulvus Thomas, Ann. Mag. Nat. Hist., ser. 6, 10:410, November, type from Las Peñas, Jalisco.