Abstract
Japanese species of the genus Ulomorpha Osten Sacken, 1869 are revised and U. amamiana Kato & Kolcsár, sp. nov. and U. longipenis Kato & Kolcsár, sp. nov. are described. A key to the four Japanese species of the genus is provided, with images of habitus and wings, and drawings of their male terminalia. Ulomorpha amamiana Kato & Kolcsár, sp. nov. is the first representative of the genus discovered from the Oriental region.