Nymphomyia alba Tokunaga

(Figs. 38–42)

Nymphomyia alba Tokunaga, 1932: 561; 1935 b: 127; Makarchenko et al. 1989: 15; Courtney 1994: 14; Takemon & Tanida 1994:120; Makarchenko 1996: 23, 2006: 739; Saigusa 2014: 80; Nakamura et al. 2015: 23; Makarchenko & Gunderina 2019: 74.

Material examined. JAPAN: 12 adult males, 10 females, Gunma Prefecture, Nuru River, tributary of the Tone River, 36.499296 N, 138.682426 E, 3–6. V.2020, leg. S. Sato ; 5 adult males, 4 females, Kochi Prefecture, Monobe River, 33.762000 N, 134.028806 E, 22.XI.2020, leg. T. Minami . RUSSIA: 23 adult males, 14 females, Kunashir Island, Kuril Islands, Kurilsky State Nature Reserve, Balysheva Creek (Filatovka River basin), about 100 m above the mouth, 44.183026 N, 146.025748 E, 19. VI.1989, leg. T. Tiunova ; 46 adult males, 24 females, the same data except unnamed creek of Filatovka River basin (lower reaches), in the area of the Filatovsky cordon, 44.194098 N, 146.020354 E, 26. VI.2013, leg. Yu. Sundukov ; 1 adult male, 1 female, 1 pupal exuvia, Kunashir Island, Pacific coast, Prozrachnyi Stream (Kosmodemyanskaya Bay basin), 44.094722 N, 145.890833 E, 24–25.VIII.2016, drift trap, leg. M. Astakhov.