Abstract
The genus Cratyna Winnertz, 1867 (Diptera: Sciaridae) is studied in the Korean peninsula. Cratyna (s. str.) suwonensis Shin, Menzel & Lee sp. nov. is described as new to science. Additionally, three species are redescribed and illustrated as new to Korea: C. (s. str.) ambigua (Lengersdorf, 1934), C. (s. str.) nigerrima (Mohrig & Krivosheina, 1979), and C. (Peyerimhoffia) vagabunda (Winnertz, 1867). A key to the Korean species is given.