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CONTEXT AND CONTENT. Order Chiroptera, suborder Microchiroptera, family Molossidae. The genus Eumops contains 8 species; E. auripendulus, E. bonariensis, E. dabbenei, E. glaucinus, E. hansae, E. maurus, E. perotis, and E. underwoodi (Freeman 1981; Koopman 1993, 1994). Four subspecies of E. bonariensis are recognized (Eger 1977; Koopman 1994): E. b. beckeri Sanborn, 1932: 354. Type locality" Trinidad, El Beni, Bolivia"(patagonicus Thomas is a synonym). E. b. bonariensis (Peters, 1874: 232), see above. E. b. delticus Thomas, 1923: 341, see above. E. b. nanus (Miller, 1900: 470), see above.

DIAGNOSIS. Compared with E. glaucinus, E. bonariensis has a skull with lambdoidal and sagittal crests that are less developed, and skull is relatively broader across rostrum. In E. bonariensis, M3 has a well-developed 3rd commissure, whereas that of E. glaucinus has only a slight indication of a 3rd …