Revision of the Neotropical weevil genus Atractomerus Duponchel and Chevrolat (Coleoptera: Curculionidae)

Forty-four species of Neotropical Anthonomini are assigned to the genus Atractomerus. Hosts of most of the species are unknown, but seven of them are known to be associated with Myrtaceae and one with Melastomataceae. Characters diagnostic of the genus and of the species groups and species assigned to the genus are described and some of them are illustrated. Five species groups, the A. punctipennis Group (3 species, United States, West Indies, Mexico, Central America, South America); the A. nigrocalcaratus Group (18 species, West Indies, Mexico, Central America, South America); the A. sextuberculatus Group (19 species, West Indies, Mexico and Central America, South America); the A. plaumanni Group (3 species, Brazil, Guatemala, Mexico); and the A. tuberculipennis Group (1 species, Bolivia, Brazil), are recognized. A key to these species groups is presented, as are keys to each of the species assigned to the groups. Twenty nine new species, Atractomerus albolateralis (Mexico), A. angusticrus (Colombia, Venezuela), A. angustus (Brazil), A. atricollis (Brazil), A. atrolateralis (Argentina), A. caligatus (Bolivia, Colombia, Panama), A. carijo (Brazil), A. collinus (Colombia, Venezuela), A. confectus (Venezuela), A. coryphaeus (Panama), A. fax (Boliva), A. glaebosus (Venezuela), A. guaicuru (Brazil), A. immigrans (Brazil), A. indicivus (Brazil, Honduras, Mexico), A. knabi (Mexico, Republica Dominicana [West Indies]), A. lacuna (Brazil, Panama), A. laesioculus (Brazil), A. nigrofasciatus (Brazil, Paraguay, Peru), A. paiagua (Brazil), A. pastinifer (Brazil), A. prolixus (Panama), A. ramirezi (Brazil, Colombia, Costa Rica, Guatemala, Paraguay, Venezuela), A. recessus (Mexico), A. schusteri (Guatemala), A. simplex (Brazil), A. tupinamba (Brazil), A. unidentatus (Brazil) and A. ypsilinum (Colombia, Venezuela). Lectotypes are designated for Atractomerus bruchi (Hustache), A. dufaui (Hustache), A. inaequalis (Champion), A. nigromaculatus (Champion), A.