An additional record of Ibalia Latreille, 1802 (Hymenoptera: Cynipoidea: Ibaliidae) from Korea with a revised key to Korean species

The Ibaliidae family, a small group within the Cynipoidea (Hymenoptera: Apocrita), includes fewer than 20 known species from the Northern Hemisphere. Ibaliids are parasitoids of wood-boring insect larvae and some are utilized as biological control agents for siricid woodwasps. In Korea, four species from two subgenera of Ibalia Thomson are recorded, with only one species, Ibalia ( Ibalia ) leucospoides leucospoides (Hochenwarth), previously documented. Recent taxonomic studies on Korean Ibaliidae have revealed that I . ( I .) aprilina Kerrich, previously known only from Japan, is now recorded in Korea for the first time. This paper re-describes I . ( I .) aprilina Kerrich with detailed illustrations of its diagnostic features and provides an updated key to the five Korean species of the genus Ibalia , including I . ( I .) aprilina . • In a taxonomic study of the Korean Ibaliidae, Ibalia ( I. ) aprilina Kerrich, which is recorded for the first time in Korea. • Ibalia (I.) aprilina Kerrich is re-described based on three Korean specimens which were collected in Sangju, South Korea. • Detailed illustrations including diagnostic characteristics of I. ( I. ) aprilina are provided. • An updated key to the five Korean species of the genus Ibalia including I. ( I. ) aprilina.