Rhyssinae Morley, 1913 is a relatively small group belonging to the family Ichneumonidae and recorded 286 species in eight genera from the world. Most rhyssines are Idiobiont ectoparasitoid of wood boring Symphyta and Coleoptera. South Korean Rhyssinae were poorly known. In the recent study of the Rhyssinae of South Korea, only four species belonging to the genera Megarhyssa and Rhyssa, have been reported: M. gloriosa (Matsumura), M. jezoensis (Matsumura), M. praecellens (Tosquinet) and R. persuasoria (Linnaeus). Five genera of the subfamily Rhyssinae (Epirhyssa, Megarhyssa, Rhyssa, Rhyssella and Triancyra) are recognized in South Korea. Two genera, Megarhyssa and Rhyssa, were previously recorded from South Korea, whereas the other three genera are recorded for the first time in Korea. A key to the five genera of Rhyssinae occurring in South Korea is provided. Genus Epirhyssa is reviewed here, and a key to the four species (E. latimandibularis (Hu & Wang), E. moiwana Matsumura, E. sapporensis Uchida and E. nigrithorax sp. nov.) is provided.

For the taxonomic studies of the subfamily Rhyssinae (Hymenoptera: Ichneumonidae), specimens were collected from March of 2001 to June of 2012 in the south Korean. For the present work, 400 specimens which collected form various laboratories in Korea and in other countries. As a result of taxonomic study, a total of 5 genera, 13 species was confirmed in Korea Rhyssinae. Additionnal discriptions, collection sites, korean records, distribution, host, keys are provided for all 13 species. The Korean of species Rhyssinae and host are listed as followes. Subfamily Rhyssinae Morley, 1913 Genus Epirhyssa Cresson, 1865 Epirhyssa nitobei Uchida, 1928 Genus Megarhyssa Ashmead, 1900 Megarhyssa gloriosa (Matsumura, 1912) Megarhyssa jezoensis (Matsumura, 1912) Megarhyssa praecellens (Tosquinet, 1889) Megarhyssa n.sp 1 Megarhyssa n.sp 2 Megarhyssa n.sp 3 Megarhyssa n.sp 4 Megarhyssa n.sp 5 Genus Rhyssa Gravenhorst, 1829 Rhyssa persuasoria (Linnaeus, 1758) Genus Rhyssella Rohwer, 1920 Rhyssella furanna (Matsumura,1912) Genus Triacyra Baltazar, 1961 Triancyra galloisi (Uchida, 1928) Triancyra hirashimai Momoi, 1970