Koreocephus maculatus Wei & Lee, gen. et sp. nov. is described from South Korea. Koreocephus is similar to Jungicephus Maa but differs from the latter by the inner tooth of the left mandible not shouldered and longer than the outer tooth; the distance between antennal sockets as long as distance between antennal socket and tentorial pit; the maxillary palp with six palpomeres and the 3rd palpomere distinctly enlarged; the labial palp with four palpomeres; malar space shorter than diameter of an ocellus; OOL much shorter than POL; the 2nd antennomere longer than broad; eyes large, the distance between eyes at level of toruli as long as the longest axis of eye; and the basal lobe of the claw obtuse. A key to the eight known genera of Cephidae from Korea is provided.