Abstract
Oreurinus cuspidatus Ito, the type species of the monotypic genus Oreurinus Ito, is redescribed and illustrated in light of newly discovered male specimens from Korea. In Mt. Gachilbong, a number of males were found sitting on rocks along the mountain stream of deep woods, while only a single female was swept from nearby vegetation. Based on morphological data, especially using postabdominal structures, Oreurinus is placed in the Trypeta group of the subtribe Trypetina (Trypetinae: Trypetini).