Nota sobre o comportamento de agrega？？o dos machos de Oxaea austera Gerstaecker (Hymenoptera, Apoidea, Oxaeinae) na caatinga do Estado da Bahia, Brasil

this note reports for the first time a "male sleeping aggregation" of the solitary bee oxaea austera gerstaecker, 1867 (hymenoptera, apoidea, oxaeinae) found near the town of ia？ú, bahia, in northeastern brazil. this is also the first record of a species of oxaea for the caatinga ecosystem.