First record of the subfamily Cylloceriinae (Hymenoptera: Ichneumonidae) from South Korea with description of one new species

South Korean species of the genus Cylloceria Schiodte (Hymenoptera: Ichneumonidae: Cylloceriinae) are reviewed. Five species of Cylloceria and the subfamily Cylloceriinae are reported for the first time from South Korea, including one new species, Cylloceria koreensis sp. nov. and four unrecorded species, Cylloceria aino (Uchida 1928), Cylloceria melancholica (Gravenhorst 1820), Cylloceria orientalis Humala 2002 and Cylloceria ussuriensis Humala 2002. Descriptions with photographs of the new species, diagnoses and a key to South Korean species of Cylloceria are provided.