Alabagrus is a New World genus of braconid wasps. All Alabagrus are apparently parasitic on leaf rolling and stem boring lepidopterous larvae. Alabagrus is primarily Neotropical with 8 species in the U.S.A. and one species, A. texanus, that reaches southern Ontario and Quebec. / One hundred and eight (108) species are described, keyed and placed in species groups. Eight (8) species have names; most of the remaining 100 species are new to science. Types must be checked in Europe before these species can be named. / Microdus nigrotrochantericus Viereck is synonymized with Bassus imitatus Cresson. A neotype is designated for Bassus sanctus Say. The following new combinations are made: Alabagrus basimaculus (Cameron) from Agathis basimacula, Alabagrus floridanus (Muesebeck) from Bassus floridanus, Alabagrus imitatus (Cresson) from Microdus imitatus, Alabagrus marginatifrons (Muesebeck) from Bassus marginatifrons, Alabagrus sanctus (Say) from Bassus sanctus, Alabagrus simulatrix (Cameron) from Microdus simulatrix, Alabagrus stigmaterus (Cresson) from Microdus stigmaterus, Alabagrus texanus (Cresson) from Microdus texanus.

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