Some morphological characters of a cobitid fish, Lefua echigonia, were examined with 96 specimens obtained at five localities in Japan;two localities (A and B) in Tokushima Pref.in Shikoku Island, one (C) in Kyoto Pref., and other two (D and E) in Niigata Pref. in Honshu Island. Specimens obtained in Tokushima Pref.differ from those in Honshu, in body proportion, the number of scales in a longitudinal row, and the origin of the dorsal fin.The number of vertebrae is mostly 36 in Tokushima Pref.but mostly 33 in Honshu. Specimens obtained in Kyoto Pref., however, are intermediate in several characters between those from Tokushima Pref.and those from Niigata Pref.
Four large specimens of freshwater salmons, 365 to 567 mm in total length, were collected in Kuzuryu Dam, and in the upper streams of Takinami River and Kuroko River, Fukui Prefecture.These specimens are two or three years old, and have higher depth of body than that of the salmonid fish“Biwamasu” (lacustrine form) in Lake Biwa, and the crimson spots on both sides of body.These spots are similar to those of the smaller“Amago”, but differ from those of the“Biwamasu”.The number of transverse scales of the present mateial is more than those of the“Biwamasu”.From the comparison described above and the fact that the“Amago”of Oncorhynchus rhodurus Jordan and McGregor was introduced artificially into the upper streams of Kuzuryu River, Takinami River and Kuroko River before, the author identified the present material as the“Amago”O.rhodurus which inhabits the rivers.