Drepana crocea, Leech

Song, Wenhui, Xue, Dayong & Han, Hongxiang, 2011, A taxonomic revision of Tridrepana Swinhoe, 1895 in China, with descriptions of three new species (Lepidoptera, Drepanidae), Zootaxa 3021, pp. 39-62 : 48

Group crocea Leech

In this species group, the white mid-cell spot, discal spot and posterodistal spot are present on the upperside of the forewing. A white discal spot ringed with brown is present on the upperside of the hind wing. In the male, the eighth tergite is nearly rectangular, the eighth sternite is bell-like or tongue-shaped; the uncus is deeply bifurcate and forms two long branches; the apexes of the branches are pointed; the socii are generally long, slender and digitate; the gnathos is composed of two parts: the dorsal part is usually semicircular and spinose, while the ventral part is a sclerotized plate with two blunt processes; the anellus is usually sclerotized and arched dorsally; the saccus is slender; the valva is narrow and long, arcuate and not reaching the apex of the uncus; the aedeagus is slender; the cornuti are composed of a spinose band and a patch of bigger spines posteriorly. In the female, the dorsal lobes of the ostial segment are small.