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About twenty years ago MARTÍNEZ proposed some new genera for the accommodation of a number of aberrant South American apho-diid beetles, until then placed in Euparia LePeletier & Serville. In 1951 he referred two species, Euparia costulataHarold and E. ovalis A. Schmidt, to his genus Lomanoxia, recognizable i.a. by having the sides of the elytra acutely inflexed. As these scarabs are exceedingly rare in collections, I was delighted at finding specimens referable to Lomanoxia among some material collected from the nests of leaf-cutting ants in Surinam; one represents a species new to science. My unsuccessful efforts to trace the type of Euparia costulata Harold in the Paris museum were compensated by the recovery of additional specimens of Lomanoxia, one of these, from northwestern Argentina, representing a second undescribed species. These new species are described below; in addition, the known species being incompletely or erroneously characterized, a re-description of these is believed t