The genus Psallus Fieber, 1858 (Phylini) is the largest group, with twenty six described species in Korea (Duwal et al., 2012). Due to recent collection in 2013, three new species are recognized from Korea. All these species are described, with images of dorsal habitus and genital structures. A checklist of the East Asian species and geographic distribution of Psallus is revised.

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.

On the study of phyline plant bug, four species of the genus Psallus Fieber have been observed as new record to Korea. According to the Korean Catalog (Yong Jung Kwon, Sang Jae Suh and Jung Ae Kim, 2001) nineteen species are recorded from the Korean peninsula. Our recent investigation discovered four additional species, Psallus cinnabarinus Kerzhner 1979, P. flavescens Kerzhner 1988, P. stackerlbergi Kerzhner 1988 and P. loginovae Kerzhner 1988. All the four species are described with genital illustration, biology and host information.