EN
We surveyed mammals at a site in Napo Province, eastern Ecuador, in 1995 and 1996. We recorded 66 species at the site, including four species new to the fauna of Ecuador (Cynomops paranus, Eumops hansae, E. maurus, and Molossus coibensis), two species recorded for the first time from eastern Ecuador (Lichonycteris obscura and Promops centralis), and a new record for Napo Province (Artibeus gnomus). Although species richness of bats is among the highest recorded in any single area in western Amazonia, the inventory still probably considerably underestimates total species-level diversity.