Two new species of the genus Idiocnemis Selys, 1886 from southern Papua New Guinea are described: Idiocnemis lakekamuensis sp. nov. from the Lakekamu Basin and I. milou sp. nov. from Lakekamu and the Kikori River lowlands. Males and females are illustrated and compared with other species of the Idiocnemis bidentata group. Both new species are known only from the Papuan Gulf Foreland area of endemism and may be considered endemic to it.
Keywords: Odonata, Damselfly, Zygoptera, new species, Lakekamu, Kikori River Basin, Papua New Guinea.