<i>Horismenus</i> species (Hymenoptera: Eulophidae) in a bruchid beetle parasitoid guild, including the description of a new species

Four species of <i>Horismenus</i> (Hymenoptera: Eulophidae) associated with <i>Acanthoscelides</i> spp.(Coleoptera: Bruchidae), three of which are also associated with <i>Phaseolus</i> spp., are treated. One of the species, <i>H. butcheri</i>, is described as new and the remaining three species are redescribed. Allfour species are diagnosed in a key. A lectotype is designated for <i>Holcopelte productus</i> Ashmead.