It was found that a Japanese species of Pasilobus (Araneidae) that has been recorded under the name of P. bufoninus (Simon 1867) is conspecific with P. hupingensis Yin, Bao & Kim 2001 described from China by the comparison of Japanese specimens with the type specimens of the two species. Redescription of the species is presented on the basis of specimens collected from Japan. Males of the species is described for the first time. Partial sequences of mitochondrial DNA (COI gene) were used to confirm the species identify of the males, because of the extreme sexual dimorphism in Pasilobus. ?Arachnological Society of Japan.
