Genera Colastes Haliday, Colastinus Belokobylskij, and Xenarcha Foerster (Hymenoptera, Braconidae, Exothecinae) from the Korean Peninsula with a discussion on the Exothecinae genus and subgenus composition

The Exothecinae genera <i>Colastes</i> Haliday, 1833, <i>Colastinus</i> Belokobylskij, 1984, and <i>Xenarcha</i> Foerster, 1863 of the Korean peninsula are reviewed. The names <i>Pseudophanomeris</i> Belokobylskij, 1984 and <i>Shawiana</i> van Achterberg, 1983 are synonymised with the genus <i>Xenarcha</i> Foerster and treated as subgenera. The two new species of <i>Colastes</i> and one new species and subspecies of <i>Xenarcha</i> are described and illustrated. <i>Exothecuseffectus</i> Papp, 1972 is included in <i>Xenarcha</i> Foerster, <b>comb. nov.</b> The composition and distribution of the world-known Exothecinae genera are discussed and an illustrated key to its genera and subgenera is presented. A key to the Korean species of the genera <i>Colastes</i>, <i>Xenarcha</i>, and <i>Colastinus</i> is also provided.