Abrostola korbi

Diagnosis. The conspecificity of Abrostola korbi and A. pacifica is stated by Behounek et al. (2010). The species is often confusingly similar to A. ussuriensis but has somewhat longer and narrower forewings with darker, more blackish-grey suffused ground colour, less distinct dark outlines of stigmata, stronger but shorter pale definition of postmedial line at tornal edge and straighter subterminal line. The diagnostic genitalia features are as follows. In males, the entire genital capsule of A. korbi is weaker sclerotised than in A. ussuriensis, the clavi of the inner saccular complex are remarkably shorter and more rounded, the juxta is considerably smaller, the vinculum is longer and narrower, the basal process of vesica is shorter but basally broader and less sclerotised and medial cornuti field is shorter, consisting of two separated groups of cornuti. Comparing the female genitalia, the ostiumantrum complex of A. korbi is much smaller and weaker sclerotised than in A. ussuriensis, the postero-lateral appendix of ductus bursae is reduced to a small protuberance, and the sclerotised lobes of the penultimate segment are narrower, flat quadrangular.