Iberoplinthus, n. gen. di Plinthini e note sul genere Mitoplinthus Reitter, 1897 (Coleoptera: Curculionidae: Hylobiinae) (5 contributo alla conoscenza dei Curculionidi della Penisola Iberica)

The species actually attributed to the genera Epipolaeus Weise, 1907 and Mitoplinthus Reitter, 1897 are examined. Epipolaeus Weise is a junior synonym of Mitoplinthus Reitter. This genus is composed of two species: M. pubescens (Petri, 1896) (type species by monotypy) and M. caliginosus (Fabricius, 1775). The populations of M. caliginosus from Central and Western Pyrenees are differentiated at subspecifical level on the basis of the structure and disposition of the sclerites of the internal sac of the aedeagus: M. caliginosus meridionalis n. ssp.. The new genus Iberoplinthus is then described. It includes Plinthus imbricatus Dufour, 1851 (type species), Plinthus perezii Brisout, 1866, Epipolaeus kricheldorffi Reitter, 1910 and Iberoplinthus curvirostris n. sp.. Plinthus holdhausi Solari, 1938, is a junior synonym of Plinthus perezii Brisout, 1866. Iberoplinthus is mainly differentiated from Mitoplinthus Reitter by the male and female genitalia, with particular regard to aedeagus, sclerites of the internal sac and spiculum ventrale. All the species belonging to the two genera are thoroughly examined. The neotypes of Curculio caliginosus Fabricius, 1775 (deposited at the British Museum of Natural History, London) and Plinthus perezii Brisout, 1866 (Museum d'Histoire Naturelle, Paris, coll. Hoffmann) are designated; lectotypes of Plinthus pubescens Petri, 1896 (Naturhistorisches Museum, Wien), Plinthus pubescens Petri, 1896 (Naturhistorisches Museum, Wien), Plinthus imbricatus Dufour, 1851 (Museum d'Histoire Naturelle, Paris) and Epipolaeus kricheldorffi Reitter, 1910 (Termeszettudomanyi Muzeum, Budapest) are also designated.