Ypsolopha japonica Moriuti, 1964

(Figs 5, 56, 106, 156)

Ypsolophus japonicus Moriuti, 1964: 199; 1977, Moriuti: 80; Moriuti, 1982: 209; Byun & Bae, 2001: 156. Ypsolopha japonica Moriuti: Zinchenko & Ponomarenko, 2008: 58; Sohn et al., 2010: 32. Type locality: Japan (Honsyû).

Description. Adult (Fig. 5): Wing expanse 24.0−25.0 mm. Forewing with R4 and R5 separated (Fig. 56).

Male genitalia (Fig. 106): Uncus inconspicuous. Socius slender, dilated before apex, ending in point. Ventral plate of gnathos broadly tongue-shaped. Valva relatively slender, narrowed at base, arched along dorsal margin. Saccus 4/5 length of socius, dilated before apex. Anellus with width about 1/3 length of phallus, extremely broad and densely hairy on distal half. Phallus somewhat broad, slightly longer than valva, dilated at inception of ductus ejacuiatorius; coecum a quarter length of phallus; cornuti about half length of phallus, composed of two rows of microspines, each row with two or three larger thorns at apex.

Material examined. 1 ♂, 2 ♀♀, Neixiang County (33°02′ N, 113°50′ E), Henan Province, 1350 m, 14−15.vii.1998, coll. Houhun Li; 1 ♀, Laotudingzi, Huanren County (41°15′ N, 125°21′ E), Liaoning Province, 8−9.viii.2009, coll. Weichun Li & Jiayu Liu.

Distribution. China (Gansu, Henan, Liaoning, Shanghai), Japan, Korea, Russia.

Diagnosis. This species is similar to Y. amoenella (Christoph) externally and internally, but can be distinguished by the separation of R4 and R 5 in the forewing (Fig. 56), the specific cornuti composed of two rows of microspines that are about half length of the phallus in the male genitalia (Fig. 106), and the intersegmental membrane between the papilla analis and the 8th abdominal segment longer than the abdomen in the female genitalia (Fig. 156). In Y. amoenella (Christoph), R4 and R5 of the forewing are stalked (Fig. 57), the male cornuti consist of two long thorns that are about 4/5 length of the phallus (Fig. 107), and the female intersegmental membrane between the papilla analis and the 8th abdominal segment is just 3/5 length of the abdomen (Fig. 157).

Remarks. Byun & Bae (2001) recorded one male specimen from Gwangleung, Korea, but did not provide the structure of male genitalia. The male genitalia are described for the first time in this paper.