MORPHOLOGY, KARYOLOGY, AND ECHOLOCATION CALLS OF RHOGEESA (CHIROPTERA, VESPERTILIONIDAE) FROM THE YUCATAN PENINSULA

Morphological analyses of 23 specimens of Rhogeessa from localities in the Yucatan Peninsula revealed significant sexual dimorphism in some characters. Although there was no significant sexual dimorphism in len gth of ear or length of tragus, males had conspicuous ear glands and f emales did not. Rhogeessa produced short, broad-band echolocation call s that showed significant inter-individual variation. Karyotypes of 16 Rhogeessa were similar to a karyotype reported from Belize and differ ent than those of R. tumida from areas adjacent to the Yucatan Peninsu la. Yucatan populations also are morphologically distinctive and we as sign them to a separate species, R. aeneus Goodwin.