A new species of the cave-dwelling springtail Lethemurus coreanus Chang and Bae, sp. n. is described from Korea. Lethemurus coreanus can be distinguished from congeners by the spinelike setae on the tibiotarsus, numbers of dental spines, number of setae on the trochanteral organ, and body macrochaetae chaetotaxy. A key to the species of Lethemurus is provided.

Cave-dwelling springtail studies in Korea initiated during 1960s by the Japanese Collembola researcher, R. Yosii, and comprehensive taxonomic studies on Korean Collembola were conducted by B. H. Lee during 1970-1990s wherein the new family Gulgastruridae was established using the type species Gulgastrura reticulosa from the Gossidonggul cave in Gangwon-do, South Korea. Eight families of cave-dwelling Collembola are known in Korea, and the family Tomoceridae is the most abundant and diverse group of cave-dwelling Collembola with 11 known species belonging to 4 genera in Korea. In this study, 12 species of Korean Tomoceridae are reviewed, and 1 new species from the genus Plutomurus and 2 new species from the genus Tomocerus are described.

We investigated Korean cave species of the superfamily Staphylinoidea from 32 local cave sites and found 21 species belonging to three families. Among them, three species, Geodromicus hermani Watanabe, G. nipponensis Watanabe and Bolitobius parasetiger Schulke belonging to Staphylinidae are newly recorded from Korea and 15 species are newly added in Korean cave-dwelling fauna. Together with one species recorded but not found in this study, a total of 22 species of Staphylinoidea are recorded in Korean cave-dwelling fauna.

A new species of the genus Coreoblemus Ueno, 1969, Coleoblemus namkungi sp. nov. is described from Korea.