Abstract
Bats of the species Myotis austroriparius are remarkable for their disjunct distribution. The three races of this species are found in widely separated geographical areas which differ greatly in environmental conditions. Myotis a. mumfordi occurs in south-central Indiana (Rice, 1955a), in extreme southern Illinois (Smith and Parmalee, 1954), and in central Arkansas (Davis et al., 1955); M. a. gatesi occurs in Louisiana (Lowery, 1943); and M. a. austroriparius occurs in Florida, Georgia, and Alabama. This wide distribution has offered an excellent opportunity to determine how behavior, social organization, and population dynamics have been modified to meet the varying ecology of this species.