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Aoplonema Knight, Daleapidea Knight, Hadronema Uhler, and Hadronemidea Reuter are revised. Aoplonema nigrum, sp. nov., A. rubrum, sp. nov., Hadronema incognitum, sp. nov., and H. mexicanum, sp. nov. are described. Hadronemidea echinata, comb. nov. is proposed for Hadronema echinataGruetzmacher and Schaffner, 1977. Aoplonemella, gen. nov. is described to accommodate Hadronema festivaVan Duzee, 1910; and Origonema, gen. nov. is described to accommodate Hadronema splendidaGibson, 1918. Scutomiris setosus, gen. et sp. nov. are described from Baja California Sur, Mexico. This new genus is superficially similar to the Neotropical genus Tupimiris. Male genitalic characters not mentioned in the original description of T. scutellatus are illustrated and compared with those of S. setosus, showing that the two are not related. Aoplonema, Aoplonemella, Daleapidea, Hadronema, Hadronemidea, Origonema, and Scutomiris form a monophyletic group herein denominated the Hadronema group. Dorsal habitus color photographs of all the species, scanning electron micrographs of selected species for each genus, and illustrations of male and female genitalic characters are provided for all species. Keys to separate the genera and species treated in this paper are presented. A phylogenetic hypothesis of relationships among the genera is proposed, and host-plant associations are discussed.