One genus, Unaica gen. n., and seven species (Unaica plumbea sp. n., Chamelania acaena sp. n., Chamelania celyphana sp. n., Chamelania corumbae sp. n., Chamelania lutea sp. n., Chamelania quasirufa sp. n., Chamelania belemana sp. n.) are described and illustrated. Chamelania is redescribed and two of its species, Chamelania jaliscana and Chamelania auricoma, are listed. Lophoderus xanthophilanus WALKER, 1863 is transferred to Chamelania. Notes on Odonthalitus RAZOWSKI, 1991 and an illustration of the male genitalia of O. poas BROWN, 2000 are included.