Opostegidae is a microlepidopteran family (Lepidoptera: Nepticuloidea) that includes almost 190 species belonging to eight genera worldwide. Since Shin recorded Opostegoides Kozlov in Korea, only two species of the genus have been recorded in Korea among the family. We found the genus Pseudopostega Kozlov, 1988 from Gangwon-do Jeongseon. This study reports the genus Pseudopostega Kozlov, 1985, for the first time. Illustrations of adult and genitalisa are also provided.

The family Opostegidae (Lepidoptera: Nepticuloidea) is a small group that is comprising 192 described species with eight genera in the world. In Korea, only one species, Opostegoides minodensis (Kuroko), has been recorded since Park made a report on the distribution of the species in 1983. As results of taxonomic studies on the family, we discovered a newly recorded species, O. omelkoi Kozlov, for the first time from Korea. All the available information including distributional ranges and host plants is provided with images of diagnostic characteristics of adult and male genitalia.