The purpose of this application, under Article 23.9.5 of the Code, is to conserve the specific name Ateuchus costatusWiedemann, 1823, a junior primary homonym of Ateuchus costatusThunberg, 1818. These names are currently in use and have not been treated as congeneric since 1869, when the homonyms were transferred to the genera Scarabaeus Linnaeus, 1758 and Sisyphus Latreille, 1807, respectively. It is highly unlikely that these names will be considered congeneric in the future. Therefore, it is proposed that Ateuchus costatusWiedemann, 1823 be conserved by ruling that it is not invalid by reason of being a primary junior homonym of Ateuchus costatusThunberg, 1818.