A new genus and three new species of Oraseminae (Eucharitidae) are described from Australia. Naumannius gen. nov. (Queensland) includes two species, N. metallicus sp. nov. and N. enascens sp. nov., based on singleton males. Orasemorpha grandilaevis sp. nov. (South Australia) is described based on a female and male. Based on other reports, Orasemorpha are known to attack immatures of Pheidole (Myrmicinae). Naumannius enascens is represented by a teneral adult that was collected at the base of a termite mound occupied by ants. Based on morphology, specifically the first gastral sternite of the male extended under the petiole and the presence of a complete transscutal articulation, Naumannius and Orasemorpha are likely sister taxa.