Cheumatopsyche okinawa Oláh and Johanson 2008

(Figs 5 A–5G)

Cheumatopsyche okinawa Oláh and Johanson 2008, 181–182, figs 295–298, male, Okinawa-jima.

Adult (Figs 5 A–5F). Forewings each 6.9–7.0 mm long in male (n = 5), 6.9–7.3 mm long in female (n = 5). Wing venation typical in the genus.

Female genitalia (Figs 5F, 5G). Tergite VIII subquadrate with convex posterior margin in lateral aspect. Sternite VIII subquadrate, larger than tergite VIII, with oblique straight dorsal margin and large subquadrate lateral lobe in lateral aspect, ventral cleft gradually wider from anterior end to posterior one in ventral aspect. Segment IX obliquely S-shaped in lateral aspects; receptacle of inferior appendage (rec.) question-mark shaped. Segment X oblique rectangular.

Specimens examined. Amami-o-shima: 2 females, Uken-son, Kogachi-gawa, tributary, 25.x.2011, TI, S & P. Okinawa-jima: 3 males, Nago-shi, Genka-gawa, near Hogen-hashi, 22–24.xi.2010, TI, L & P; 16 females, same locality, 18.iv.2011, TI, P & L; 2 males, Nago-shi, Genka-gawa, 40 m a.s.l., 16.iii.2012, TI, P & L; 3 females, Kunigami-son, Yona-gawa, Nakafukuji-bashi, 18.x.2014, TI, L; 1 female, Kunigami-son, Yona-gawa, Heigi-bashi, 18.iii.2012, TI, S; 1 male, Kunigami-son, Yona-gawa, small tributary, 23–25.xi.2011, TI, S; 1 female, Kunigamison, Yona, Sukuna-gawa, 21.iii.1999, TI & AO, L; 2 females, Kunigami-son, Shinrin Park, 9–10.iv.2011, TI, L & P. Kume-jima: 5 males, 12 females, Shirase Dam, 14.iii.1998, M. Maruyama.

Distribution. Japan: Ryukyu (Amami-o-shima, Okinawa-jima, Kume-jima). Endemic to central Ryukyu.

Remarks. This species was originally described from Okinawa-jima (Oláh & Johanson 2008), and recorded here from Amami-o-shima and Kume-jima. The male of this species is characterized by the large subtriangular mesocaudal lobe of segment X (m.c.l.), each long lateral lobe of segment X (l.l.) with subacute apex and developed, preanal appendage of segment X (p.a.) (Figs 5 A–5C). The female, first described here, is separated from other congeneric Ryukyu species by the subquadrate lateral lobe with gently narrowing mesal margins in ventral aspect, and in lateral aspect the question-mark-shaped receptacle (rec.) on each side of segment IX for receiving the inferior appendage (Figs 5F, 5G).

Japanese name. Okinawa-kogata-shima-tobikera.