The family Periscelididae Oldenberg is reported for the first time from Korean fauna along with three nominate species, Cyamops hotei Sueyoshi, 2004, Stenomicra angustiforceps Sabrosky, 1965 and S. fascipennis Malloch, 1927. Stenomicra have been collected at grassy areas, whereas Cyamops have been founded near wet habitats. The descriptions and illustrations of external features of these species are provided here.

The genus Acymatopus Takagi is reported for the first time from Korean fauna along with two nominate species, A. minor Takagi, 1965 and A. takeishii Masunaga, Saigusa & Yang, 2005. This genus belonging to the subfamily Hydrophorinae in the family Dolichopodidae, is comprised of only six species in the world and distributed only in Japan and China yet. Both adults and larvae of this genus are known to be found on rugged and rocky marine shores of the tidal zone. The authors found the first recorded species in the west seaside of Korea, where many barnacles are inhabited. The descriptions and illustrations of external features including male genitalia of newly recorded species are provided here.