Twenty-five species of the genus Psallus Fieber 1858 are revised from Korean Peninsula. Two new species are described: Psallus sp. nov. 1 and P. sp. nov. 2. Four species, Psallus rogeoguttatus Yasunaga et Vinokurov 2000, P. cinnabarinus Kerzhner 1979, P. flavescens Kerzhner 1988, and P. longinovae Kerzhner 1988 are reported for the first time. The checklist is reconstructed and a key is provided to distinguish all Korean species with the clear dorsal photos and illustrations of male genitalia. In addition, biology is discussed for all possible species according to collection data.

• Ram Keshari Duwal(Insect Biosystematics Laboratory, Research Institute for Agricultural and Life Sciences, Department of Agricultural Bio-Technology, Seoul National University)
• Seunghwan Lee(Insect Biosystematics Laboratory, Research Institute for Agricultural and Life Sciences, Department of Agricultural Bio-Technology, Seoul National University)