A new species of the cleptoparasitic bee genus Microsphecodes Eickwort & Stage (Halictinae: Halictini) is described and figured from Amazonian Peru. Microsphecodes stenochorus Engel, new species, is closest to M. kathleenae (Eickwort) and M. russeiclypeatus (Sakagami & Moure) but may be distinguished by coloration and propodeal sculpturing. Microsphecodes consists of two groups of divergent morphologies and these are newly considered as distinct subgenera: Microsphecodes s.str. and Baeosphecodes Engel, new subgenus. Provisional keys to species of Microsphecodes are provided.
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