Homolophus arcticus BANKS and H. rishiri n. sp. are described from specimens collected from northern Hokkaido, Japan. This is the first record for the former species from Japan. Homolophus rishiri n. sp. is known from Is. Rishiri, off the northernmost part of Hokkaido, and is clearly distinguishable from H. arcticus by its small and darkly colored body and by the shape of the penis.
