Tridrepana subadelpha, Song & Xue & Han, 2011

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 : 45

Tridrepana subadelpha Song, Xue & Han, sp. nov.

Figs 11–12, 63, 87

Description. Head. Antenna fulvous, bipectinate in male. Frons brown in upper half, pale yellow below, smoothscaled. Labial palpus pale yellow, reaching frons in male. Vertex with anterior half brownish yellow, posterior half pale yellow. Thorax. Dorsum and legs pale yellow. Both mid and hind tibia in male with one pair of terminal spurs, outer spur shorter than inner one. Length of forewing: ♂ 13 mm. Wings: forewing apex moderately falcate, outer margin under apex slightly concave. Ground colour pale yellow. Forewing with brown crescent patch under apex, with one brownish black ovate spot inside; antemedial line grayish brown, punctuate; postmedial line brown, punctuate, bent inwards below M 1 and outwards between M 2 and CuA 2; discal spot and mid-cell spot grayish brown, posterodistal spot a white strip, ringed with brown; two big round grayish brown patches near lower angle of cell, below base of M 3 and CuA 1, each with a dark brown ovate spot inside; fringes dark brown from apex to M 3, bright yellow below M 3. Hind wing with antemedial and postmedial lines similar to those of forewing, the latter strongly bent inwards under CuA 2; one small elongate pale grayish brown patch near lower angle of cell, a brown spot inside the patch between M 3 and CuA 1; fringes bright yellow. Ventral side pale yellow, all markings indistinct. Venation. Forewing: R 2 and R 3+4 diverging from apex of areole, M 1 stalked with lower margin of areole. Abdomen. Pale yellow. Male genitalia. Uncus sclerotized, bifurcate, each lobe with two parts, the inner half semicircular, the outer part broad, digitate and elongate. Socii sclerotized, digitate, slender. Median process of gnathos elliptical, covered with hair-like spines. Valva very short, digitate, terminal half with long and dense hairs. Saccus short, triangular. Anellus degenerate. Aedeagus stout, sclerotized posteriorly, cornuti fascicled strong spines. Female genitalia. Unknown.

Diagnosis. This new species belongs to the sadana species group, and is close to T. sadana , T. finita , T. hypha and T. adelpha . On the wing pattern, the ground colour and the patches near the lower angle of the forewing cell in T. subadelpha are paler than in those four species; the forewing apex is less falcate than in T. sadana and T. adelpha . In the male genitalia, T. subadelpha is distinctive in that each lobe of the uncus divides into two parts, the inner semicircular and the outer extended into a digitiform process. The lobes of the uncus are not bifid in T. sadana ( Fig. 62), T. hypha ( Fig. 65) and T. finita ( Fig. 66). In addition, the median process of the gnathos is less broad and flat than in T. sadana . T. subadelpha is different from T. adelpha ( Figs 64, 88) in that: the uncus is deeply bifurcate, but just concave in T. adelpha ; the inner half of the uncus lobe is semicircular, but truncate in T. adelpha ; the outer branch is much longer and thicker, well extended beyond the inner half, with obtuse apex, but in T. adelpha the outer branch is distinctly smaller, and the apex is acute.

Material examined. Holotype: ♂, CHINA, Yunnan: Baoshan, Baihualing , 1520 m, 11–13.VIII.2007, coll. Wu Chunguang ( IZCAS) . Paratypes: Yunnan: 2♂, Tengchong, Dahaoping , 2020m, 5–7.VIII.2007, coll. Xue Dayong, Wu Chunguang ( IZCAS) .

Etymology. The species name is combined from Latin prefix sub- and adelpha , in recognition of the similarity of its genitalia to T. adelpha .

Distribution. China (Yunnan).