The family Coniopterygidae belonging to Neuroptera with Semidalis aleyrodiformis (Stephens) is introduced from the Korean Peninsula in the present study. Taxonomic descriptions of the family and the species and illustrations of its wing and male genitalia are presented.

A recent study on Neuroptera brought us an attention to a newly found group, Coniopterygidae, dustywings. As we reported for the first time this year, this family has not been taxonomically reported in South Korea while it has been reported in North Korea before. In fact, this is known to be found in Japan and China, which means this probably have been around us for a long time. However, we found there was one species of which the name was once mentioned in a paper in 1978. It was reported by Kim, H.S. et al. in 1978 in a study of citrus red mite and its natural enemies (Kim et al., 1978). Although the spelling of the species was wrong even as a synonym, the species was found to be a natural enemy of citrus red mite, Panonychus citri in Jeju-do. We here report this taxonomically undescribed species for the first time in South Korea. The species is superficially similar to white flies but, unlike white flies, it is on our side as a natural enemy.