One specimen examined (AMNH 146980) is distinctly larger than the others here assigned to _A. aztecus_, but does not exceed the maximal measurements given by Davis (_loc. cit._) for the species. This specimen also has a narrower M2, and relatively and actually narrower braincase than other specimens (see measurements). Specimens from Rancho del Cielo were collected in a limestone cave in the cloud forest. A female taken on July 2 carried a small embryo and another obtained on August 14 had an embryo that appeared to be nearly ready for birth. _Measurements._--Respective external and cranial measurements of three males (AMNH, uncatalogued) and a female (AMNH 146980) are as follows: total length, 58, 65, 66, 73; length of hind foot, 13, 12, 12, 13; length of forearm, --, 43, 40, 41; greatest length of skull, 21.6, 22.4, 21.5, 23.0; zygomatic breadth, 13.0, 12.8, 13.0, 12.4; least interorbital constriction, 5.2, 5.7, 5.5, 6.0; length of maxillary tooth-row, 7.0, 7.1, 6.9, 7.1; breadth of braincase, 10.0, 9.8, 10.0, 9.5. _Records of occurrence._--Specimens examined, 7, all from Rancho del Cielo, 3300 ft., (AMNH). =Enchistenes hartii= (Thomas) Little Fruit-eating Bat 1892. _Artibeus hartii_ Thomas, Ann. Mag. Nat. Hist., ser. 6, 10:409, November, type from Trinidad, Lesser Antilles. 1908. _Enchistenes hartii_, Andersen, Proc. Zool. Soc. London, 2:224, September 7. _Distribution in Tamaulipas._--Known only from Aserradero del Infernillo. _Enchistenes hartii_ is known from Tamaulipas only by the cranium reported by Goodwin (1954:5), and this is the northernmost known occurrence. The bat has not been reported from any other Mexican state bordering on the Gulf of Mexico. =Centurio senex= Gray Wrinkle-faced Bat 1842. _Centurio senex_ Gray, Ann. Mag. Nat. Hist., ser. 10, 10:259, December, type locality erroneously given as Amboyna, East Indies; subsequently restricted to Realejo, Chinandega, Nicaragua, by Goodwin (Bull. Amer. Mus. Nat. Hist., 87:327, December 31, 1946). _Distribution in Tamaulipas._--Tropical areas of southern part of state. The single specimen examined, a female weighing 23 grams that carried an embryo (17 mm. crown-rump length), was taken on June 14 in a mist net stretched between oak trees in the Sierra de Tamaulipas. One other female and one cranium have been reported from Tamaulipas. The specimen examined differs from two seen from southern México (5 mi. SW Teapa, Tabasco, and 2 mi. S Tollosa, Oaxaca) in being brownish instead of grayish, but resembles in color two specimens from Cozumel Island, Quintana Roo.