Abstract
Japanese species of the family Ptychopteridae are revised. Two species of the genus Bittacomorphella, and ten species of the genus Ptychoptera are recognized in Japan. Four new species, Ptychoptera yamato sp. nov., P. kyushuensis sp. nov., P. ichitai sp. nov. and P. pallidicostalis sp. nov., were described. Keys to Japanese genera and species, descriptions, and illustrations are provided for all species. Systematics and zoogeography of the Japanese species of Ptychoptera are discussed.