The species of the genus Cratospila Foerster, 1863 (Braconidae, Alysiinae) from South Korea are revised, and the genus is recorded for the first time from South Korea. All four species are new to science, and Cratospila albiferasp. nov., C. ejuncidasp. nov., C. luteocephalasp. nov., and C. syntomasp. nov. are described and illustrated herein. In addition, COI has been sequenced of three species. A key to the Korean species is provided.

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Several species of the genus Aphidius are well known as commercial biocontrol agents of pest aphids, and more than 130 species of the genus have been recorded worldwide. To date, only 15 Aphidius species have been recorded in South Korea. Using the DNA barcode region (ca. 658 bp) of mitochondrial cytochrome c oxidase subunit I (COI), we amplified sequences of 15 Aphidius Korean species, aligned them in combination with 23 reference species retrieved from GenBank for comparison and identification, and then reconstructed a barcode phylogeny by the neighbour-joining method. As a result, three Aphidius species were found to be new to Science. Descriptions and illustrations of the three species new to Science – Aphidius longicarpussp. nov., A. longistigmussp. nov., and A. asiaticussp. nov. – are provided, together with their phylogenetic position within the genus Aphidius. In addition, a redescription of A. areolatus, a parasitoid of maple aphids (Peryphillus spp.), is also given.

The species of the genus Phaenocarpa Foerster, 1863 (Braconidae: Alysiinae) from South Korea are revised, and the genus is recorded for the first time from South Korea. Three species, Phaenocarpa artotemporalissp. nov., P. brachyurasp. nov. and P. lobatasp. nov., are new to Science, and two species, P. masha Belokobylskij, 1998 and P. fidelis Fischer, 1970, are newly recognized in South Korea. They are described and illustrated herein with a provision of the identification key to the Korean species. In addition, the DNA barcode region of the mitochondrial cytochrome c oxidase subunit I (COI) has been analyzed for the six species including P. ruficeps for genetic comparison.

The species of the genus Hylcalosia Fischer, 1967 (Braconidae: Alysiinae) from South Korea are revised. One species, Hylcalosia bicolorsp. nov., is new to science. They are described and illustrated herein and an identification key to the Korean species is added. In addition, the DNA barcode region of the mitochondrial cytochrome c oxidase subunit I (COI) has been analysed for the new species and H. sutchanica is used for genetic comparison.