Hydropsyche verrucosa (Ulmer 1911)

(Figs 8 A–8H)

Hydromanicus verrucosus Ulmer 1911, 397, 399–400, figs 9, 10, male, Taiwan; Malicky & Chantaramongkol 2000, 797, 829, pl. 3, male, Taiwan.

Hydatomanicus verrucosus: Ulmer 1951, 299.

Hydropsyche verrucosa: Geraci et al. 2010, 926.

Adult (Figs 8 A–8H). Forewings each 8.4–11.2 mm long in male (n = 6), 10.0–11.0 mm long in female (n = 8). Wing venation typical in the genus.

Female genitalia (Figs 8 G–8H). Tergite VIII subquadrate with convex dorsal margin in lateral aspect. Sternite VIII cleft about 4/5 from base in ventral aspect, forming pair of lateral lobes, each oval in lateral aspect and subquadrate in ventral aspect. Segment IX nearly rectangular with pair of setal bands caudally in lateral aspect; lateral lobe large; receptacle of inferior appendage (rec.) roundish with two flanges in lateral aspect. Segment X rectangular.

Specimens examined. Amami-o-shima: 3 males, 1 female, Yamato-son, Yuwan-gama, 18–19.iv.2015, SI, L. Ishigaki-jima: 1 male, 1 female, Ara-kawa, 55 m a.s.l., 19.iii.2016, TI, S. Iriomote-jima: 1 male, Urauchi-gawa, Kampire-no-taki, 85 m a.s.l., 29.x.2012, TI, S; 1 male, same locality, 22.x.2016, TI, S.

Distribution. Japan: Ryukyu (Amami-o-shima, Ishigaki-jima, Iriomote-jima). Taiwan. New to Japan.

Remarks. This species was originally described as a species of the genus Hydromanicus Brauer based on a male from Kanshirei, Taiwan (Ulmer 1911), and Ulmer (1951) designated this species as the type species of the genus Hydatomanicus Ulmer. This species is known in many localities of Taiwan (Hsu 1997; Malicky & Chantaramongkol 2000). The genus Hydatomanicus Ulmer was synonymized with the genus Hydropsyche Curtis by Geraci et al. (2010) with evidence from DNA and male morphology. The male of this species is characterized by the thick apicolateral lobes of segment X with an oblique ridge and round caudal margins; and the long undulated basal segment of the inferior appendage in lateral aspect. The female, first described here, is distinguished from those of other congeneric Ryukyu species by the shape of the large lateral lobes of sternite VIII, i.e. oval in lateral aspect and subquadrate in ventral aspect.

Japanese name. Kobu-shima-tobikera.