New species of grasshopper genus Aptoceras Bruner, 1908 (Orthoptera, Acrididae, Ommatolampidinae, Ommtolampidiini) from Iguaçu National Park (Southern Brazil), including a taxonomic key and distribution data.

A new species of the Neotropical grasshopper genus Aptoceras Bruner, 1908 is described from individuals collected in the Iguaçu National Park, Paraná State, Brazil. Aptoceras iguassuensis n. sp. inhabits in shrubs in the Atlantic Forest. The species belongs to the genus group Nicarchae Brunner von Wattenwyl, 1893. Descriptions, photographs, and illustrations of the male and female, as well as photographs of the male phallic sclerites are presented. An identification key for the five species of Aptoceras from Brazil and a distribution map are also given.