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Pachyonychis paradoxus Clark, 1860 and Pachyonychus paradoxus Melsheimer, 1847 are two species of Alticini whose strikingly similar names have led to significant confusion in the past. Recent study of American Oedionychina Chapuis, 1875 raised doubts about the validity of the subtribal placement of Pachyonychis Clark. Although general characteristics put this genus in Oedionychina, other features, especially the unusual shape of the pronotum, suggested that this monotypic genus would belong in Monoplatina Chapuis, 1875 instead. To collect evidence for the validity of its current placement, we compared external and genitalic morphology of both species to other members of Monoplatina and Oedionychina. Here we present images and descriptions of female genitalia for both species and male genitalia of Pachyonychus paradoxus Melsheimer, to our knowledge the first of their kind, and we conclude that the evidence supports the current subtribal placement of these two genera. Lectotypes are designated for both Pachyonychis paradoxus Clark and Pachyonychus paradoxus Melsheimer.

West Indian genera of the flea beetle subtribe Oedionychina Chapuis, 1875 are reviewed. Two new genera and one new species are described: Argusonychis Konstantinov, Van Roie, & Furth gen. nov. with Argusonychis clarki Konstantinov, Van Roie & Furth sp. nov. as the type species (Bahamas); and Ciguapanychis Konstantinov, Van Roie & Furth gen. nov. with Alagoasa bicolor (Linnaeus, 1767) as the type species (Puerto Rico). An illustrated key to the genera found in the West Indies is provided. Each genus is illustrated with images of external and internal morphology, including thoracic structures, metendosternite, and female and male genitalia. Asphaera subfasciata Clark, 1860 is designated as the type species for Asphaera Duponchel & Chevrolat in d’Orbigny, 1842. The genus Ptena Chevrolat, 1836 is considered a long-overlooked senior synonym of Asphaera; the use of Asphaera is maintained. The lectotypes are designated for: Chrysomela albicollis Fabricius, 1787, Oedionychis crucipennis Suffrian, 1868, and Haltica decipiens Klug, 1829. Pleurasphaera Bechyné, 1958 is recognized as an objective junior synonym of Litosonycha Chevrolat, 1836 since these two generic names share the same type species, Haltica decipiens Klug, 1829. Oedionychis punctipennis Blake, 1971 is synonymized with Alagoasa sharpi (Jacoby, 1897). The following 17 new combinations are proposed: Alagoasa lunata (Fabricius, 1801), Alagoasa sharpi (Jacoby, 1897), Alagoasa smithi (Jacoby, 1897), Argusonychis megalopia (Blake, 1939), Argusonychis orientensis (Blake, 1959), Argusonychis zayasi (Blake, 1959), Asphaera amplilimbata (Blake, 1959), Asphaera cristalensis (Blake, 1959), Ciguapanychis bicolor (Linnaeus, 1767), Ciguapanychis dimidiatus (Olivier, 1808), Ciguapanychis fasciatus (Fabricius, 1798), Ciguapanychis jamaicensis (Jacoby, 1894), Ciguapanychis pseudofasciatus (Blake, 1940), Ciguapanychis viridipennis (Blake, 1971), Kuschelina pseudothoracica (Blake, 1945), Omophoita turquino (Zayas, 1988), and Walterianella gurneyi (Blake, 1968). The following three species are removed from synonymy and restored to species status as new combinations: Ciguapanychis cinctus (Olivier, 1808), Ciguapanychis lantanus (Blake, 1928), and Ciguapanychis purpurellus (Blake, 1940).