Entomacis, a moderately sized parasitic wasp genus within Diapriidae, consist of 56 species in the world. In East Asia, 11 species are recorded from Japan, 6 species from South Korea and Russia and 4 species from China. In this study, two newly recorded species of the genus Entomacis Förster, 1856 (Hymenoptera: Diaprioidea: Diapriidae), E. laticeps Chemyreva, 2015 and E. penelope Nixon, 1980, are reported from South Korea. A revised identification key to the South Korean species, diagnosis, illustrations and photographs of the diagnostic characteristics are provided herein

Diapriidae are the largest family in Diaprioidea with 2,087 species, 194 genera and three subfamilies that are distributed in all biogeographic regions. Most members of the family are primarily solitary or gregarious endoparasitoids of various dipteran larvae or pupae. Some species are also known to attack hymenopteran, coleopteran and lepidopteran species. To date 18 species in total are known from South Korea. We present an updated checklist of 18 South Korean species of Diapriidae, with correcting some errors previously made. New Korean names for each species are also suggested herein.

Psilomma Förster, a small and rare genus within the tribe Pantolytini (Diapriidae: Belytinae), consists of three species widely distributed in Europe: P. dubium Kieffer, 1908; P. fuscicornis Kieffer, 1908; P. fusciscapis Förster, 1861 (Macek 1990). This genus is easily distinguished from other Pantolytini genera by the sickle form of mandibles. Up to date, Psilomma has not yet been recorded out of Europe. As a result of the present study, the genus Psilomma is reported from the South Korea for the first time based on a species of P. dubium. Also, the known range of Psilomma is extended from Europe (Western Palaearctic) to South Korea (Eastern Palaearctic). A detailed redescription, photographs of this species are given.

Subfamily Ismarinae traditionally has been belong to the superfamily Proctotrupoidea, family Diapriidae. But recently, Sharkey (2007) has been placed family diapriidae in a separate superfamily of the infraorder Proctrupomorpha, the Diaprioidea, together with the New Zealand endemic Maamingidae and the cosmopolitan and speciose Diapriidae. After, subfamily Ismarinae is raised to family status Ismaridae stat. nov., also included the family Ismaridae within Diaprioidea (sharkey et al. 2011). The superfamily Diaprioidea Haliday, 1833 is a moderate large group of parasitoid wasps. Diaprioidea comprise five families (four extant family: Diapriidae Haliday 1833, Ismaridae Thomson 1858, Maamingidae Early, Masner, Naumann & Austin 2001 and Monomachidae Ashmead 1902; one fossile family Spathiopterygidae Engel & Ortega-Blanco 2013) of generally fairly small wasps, with a total of 2,109 species in the world. Family Ismaridae is a small family contains a single genus and 32 described species in the world and previously unrecorded in Korea. Ismaridae is morphologically distinguished from other families of Diaprioidea by the following combination of characteristics: antennae inserted close to the clypeus; position of toruli that are opening forward (not upward); notauli absent, with mesocutum broadly arched in lateral view; antennal formula 15-14. Also, the biology of this family is very poorly studied, only a few species known as hyperparasitoids of Auchenorrhyncha (Hemiptera) through dryinids (Hymenoptera). In this study, A new species, Ismarussp. nov. and one unrecorded species, Ismarus halidayi Foerster 1850, are reported from South Korea. Photographs of diagnostic characters are provided herein.