Molossidae (including Tomopeatinae) is a diverse group of fast-flying aerial insectivores. Some species live in very large colonies that can exceed 5 million individuals. Molossidae currently includes over 13 genera and 80 species (Koopman, 1993; Sudman et al., 1994). Two clades are currently recognized within Molossidae: Tomopeatinae and Molossinae (Sudman et al., 1994; Simmons, 1998; Simmons and Geisler,1998). Tomopeatinae is monotypic, containing only Tomopeas ravus, a species found only in Peru. All other molossids belong to Molossinae.