During a survey of small mammals in the municipality of Santa Maria Chimalapa in eastern Oaxaca, Mexico, we obtained the first record of Thomas' shaggy bat (Centronycteris centralis, Vespertilionidae) and the funnel-eared bat (Natalus lanatus, Natalidae), as well as the second record of the false vampire bat (Vampyrum spectrum, Phyllostomidae) for the state. With these new records, the list of bats for Oaxaca increased to 86 species, confirming Oaxaca as the Mexican state with the greatest number of species of terrestrial mammals and, in particular, the Chimalapas region as one of the most diverse regions in the country.