The genus Megastylus is a moderate group of the subfamily Orthocentrinae, comprising 38 species in two subgenera from worldwide. The subfamily Orthocentrinae is a high proportion of the genera are cosmopolitan in distribution. Orthocentrines are known as almost solitary koinobiont endoparasitoids. We report this genus for the first time from South Korea. In this study, descriptions of some new species, photographs of diagnostic characterists are provided.

• Jin-Kyung Choi(Department of Science Education, Daegu National University of Education, Insect InquiryㆍEducation Institute, Daegu National University of Education)
• Andrei E. Humala(Forest Research Institute, Karelian, Centre of Russian Academy of Sciences, Russia)