Both genera studied here, Rhinoppia and Suctobelbella are diversely represented in the northern hemisphere, but in Korea, only three species of the second genus are known. We propose a new species, Rhinoppia properecta sp. nov., and provide supplementary descriptions of seven species of Suctobelbella, i.e., S. acutidens (Forsslund, 1941), S. arcana Moritz, 1970, S. longidentata Chinone, 2003, S. subcornigera (Forsslund, 1941), S. (Flagrosuctobelba) kantoensis Chinone, 2003, S. (F.) lata Chinone, 2003, and S. (Ussuribata) latirostris (Strenzke, 1950), which are reported from Korea for the first time. The distribution and diversity of each genus are discussed, and habitat ecology of species reported is given. Furthermore, a key for the identification of adults of the known species of Suctobelbella in Korea, is provided.