Athyreus aeneus Klug 1843

Updated key to males in the Athyreus aeneus species group (modified from Howden & Martínez 1978) 3(2) Tubercle of anterior pronotal margin well defined, sometimes small, tip acute..................................... 4 - Tubercle of anterior pronotal margin poorly developed, obtuse or obsolete........................................ 5 4(3) Clypeal horn absent. Brazil: Bahia .............................. Athyreus arretado Celante & Carvalho, new species - Clypeal horn present. Brazil: Ceará, Rio Grande do Norte, Paraíba, Pernambuco, Bahia, Minas Gerais, Paraná .......... 4a 4a(4) Pronotum with seven horns, anterior horn vertical; anterior median horns slanted anteriorly; posterior median horns vertical; posterior horns with acute apex, curved toward midline. Brazil: Bahia ............................................................................................ Athyreus joseferreirai Ferreira, Grossi, & Vaz-de-Mello, 2023 - Pronotum with three horns, a central horn on the anterior margin and a pair of horns on the posterior third of the pronotum. Brazil: Ceará, Rio Grande do Norte, Paraíba, Pernambuco, Bahia, Minas Gerais; Paraná ............................ 4b 4b(4a) Pronotal disc with anterior transverse carina reaching lateral edge; color dark bluish green with bronze caste. Brazil: Paraná ................................................................................ Athyreus aeneus Klug, 1843 - Pronotal disc with lateral carina obsolete, short, situated on posterior half; color largely testaceous or castaneous. Brazil: Ceará, Rio Grande do Norte, Paraíba, Pernambuco, Bahia, Minas Gerais .................... Athyreus vavini Boucomont, 1902