In a review of the genus Pyrausta (Lepidoptera: Crambidae: Pyraustinae) in the Korean peninsula, 12 species including three species of North Korea are recognized. Among them, P. nigrimaculata Bae et Kim is described as new to science, and P. chrysitis Butler is reported for the first time from Korea. A Key to species of the genus, based on the external characters, is provided. Morphological descriptions with illustrations of the genitalia for the all known species are given.

The Korean species of genus Nephopterix Hübner, 1825 is revised. Seven species of genus Korea are treated. Among them, one species, Nephopterix paraexotica is described as new to science and two species, N. fumella (Eversmann) and N. tomisawai Yamanaka, are recorded for the first time from Korea. Adults, wing venations, and genitalia of both sexes are illustrated. Collecting data and biological informations for the species are also given. Keys to all known species of the genus based on external and genitalic characters are provided.