Abstract
The Japanese species of Protonemura are treated, and the differential characters of each are illustrated. Besides four previously known species, P. curvata Zhiltzova, 1981 (new to Japan), P. ermolenkoi Zhiltzova, 1982 (new to Japan, and first description of the female), P. hotakana (Ueno, 1931), and P. towadensis (Kawai, 1954) (first description of the female), eight species are described as new to science : P. angulata, P. baumanni, P. excavata, P. hakkodana, P. kohnoae, P. orbiculata, P. seticollis, and P. strumosa. They are assigned to four groups by similarities of the male terminalia, and a key to the groups is given. In addition, one undetermined female of this genus is recorded from Okinawa Island, southwest Japan, and is illustrated.
