The family Cryptophagidae Kirby (Coleoptera: Cucujoidea) comprises minute beetles, with approximately 800 described species within about 50 genera worldwide. Most members of this family are found in moldy environments and feed on fungal spores and hyphae. The Korean cryptophagid fauna is poorly known, consisting of 22 species belonging to 8 genera. In this study, seven species of Cryptophagidae reported for the first time in Korea: Atomaroides ussurica (Lyubarsky), Cryptophagus micaceus Rey, Cryptophagus pumilus Reitter, Cryptophagus zonatus Lyubarsky, Henoticus pilifer Reitter, Micrambe (Micrambinus) bimaculata (Panzer), and Serratomaria vulgaris Sasaji. Illustrations of habitus, male genitalia, and collection localities of these seven species are provided.

The genus Caenoscelis C. G. Thomson (Coleoptera: Cryptophagidae: Cryptophaginae) comprises approximately 30 species in the world, primarily distributed in the Holarctic region. Although 15 Caenoscelis species occur in the Palearctic region, only a single species, Caenoscelis sibirica Reitter, has been documented in Korea. In this study, Caenoscelis koreanus sp. nov. is described, and Caenoscelis ferruginea (C. R. Sahlberg) is reported for the first time in Korea. The new species can be distinguished from other Caenoscelis species by their subquadrate antennomere 10, fully developed hind wings, and male genitalia with subacute parameres and indistinctly separated lateral lobes. Illustrations of habitus, diagnostic characters, and a distribution map of Korean Caenoscelis species are provided.