Ypsolopha acuminata (Butler, 1878)

(Figs 54, 104, 154)

Chilo acuminatus Butler, 1878: 61 .

Cerstoma acuminatus (Butler): Meyrick, 1914: 52 (as syn. of caudella Linnaeus, 1767). Ypsolophus acuminatus (Butler): Moriuti, 1964: 210; Beccaloni et al. 2003 [accessed 9 January 2012]. Cerostoma caudella (Linnaeus): Meyrick (in part), 1914: 54; Meyrick, 1928: 798. Ypsolopha acuminatus (Butler): Moriuti, 1977: 111.

Ypsolopha acuminata (Butler): Sinev & Dubatolov, 2007; Sohn et al., 2010: 30. (Not Therstis acuminata: Matsumura, 1931: 1104; Inoue, 1954: 36). Type locality: Japan.

Adult (Fig. 54): Wing expanse 25.0 mm. Forewing with R4 and R5 long stalked, hindwing with M2 and M3 stalked (Fig. 104).

Material examined. 1 ♂, Mt. Liupan (35°24′ N, 106°14′ E), Ningxia Hui Autonomous Region, 1900 m, 30.vi.2007, coll. Xinpu Wang.

Distribution. China (Heilongjiang, Ningxia), Korea, Japan, Russia.

Diagnosis. This species can be easily distinguished from its congeners by the stalked M2 and M 3 in the hindwing (Fig. 104). The male genitalia are characterized by having a nearly semicircular valva, and the slender saccus that is as long as the socius (Fig. 154).