Tridrepana bicuspidata, 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 : 51

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

Figs 46–49, 78, 101, 123–124, 136

Description. Head: Antenna fulvous, bipectinate in male. Frons brown in upper half, pale yellow in the rest, smoothly scaled. Labial palpus yellow, brown at apex, about one third extending beyond frons in male. Vertex pale fulvous. Thorax. Dorsum yellow. Legs pale yellow, slightly brown at apex. Hind tibia in male with one pair of terminal spurs, outer spur shorter than inner one. Length of forewing: ♂ 14–16 mm. Wings: forewing with apex falcate, outer margin under apex nearly straight. Ground colour yellow on both wings. Forewing with brown crescent patch below apex; antemedial line indistinct; postmedial line brown, wavy, not reaching costa, angled inwards below M 1 and outwards on M 3, bounded exteriorly by an indistinct pale brown line; submarginal line composed of a series of blackish spots, much larger and blacker between R 5 and M 3, on the inner margin of the apical crescent patch; mid-cell, cell and posterodistal spots white, surrounded with reddish brown. Hind wing with postmedial line curved, indistinct, bent inwards on anal fold, accompanied by a series of dots posteriorly; submarginal line black, regularly punctuate; discal and posterodistal spots white, ringed with brown. Ventral side yellow, markings almost invisible, except brown crescent patch on forewing apex; anterior part of postmedial line brown, punctuate; forewing with discal spot large and brown, posterodistal spot visible in some specimens, small and brown. Venation. Forewing: R 1 anastomosing with R 2-4 for a short distance in basal one third of areole, R 2 diverging before the apex of areole, M 1 stalked with lower margin of areole. Abdomen. Yellow, slender. Male genitalia. Uncus sclerotized, bifurcate, branches of uncus also bifurcate medially, with outer process long, curving outwards, inner process short, about one third length of outer forks, triangular and sharply pointed apically. Socii weakly sclerotized, broad and short. Dorsal part of gnathos broad, semicircular, hairy; ventral plate of gnathos trapezoid, with two digitiform processes. Valva long, arcuate, not reaching apex of uncus, terminal half gradually narrowing toward apex, bending upwards. Saccus slender and elongate, as long as uncus. Anellus strongly sclerotized, almost a long plate, basal part convex, with two broad basal branches. Aedeagus slender, sclerotized posteriorly, cornuti a patch of large spines. The eighth tergite quadrate, with posterior margin slightly concave; the eighth sternite bell-like, with posterior margin a little extended. Female genitalia. Ovipositor short, two oval processes near the ostium bursae. Apophyses posteriores slightly longer than apophyses anteriores. Ductus bursae sclerotized and long. Corpus bursae oval, membranous, with two scobinate spindle-shaped signa.

Diagnosis. This new species belongs to the crocea species group, and is close to T. bifurcata in the similar ground colour, spots and patches on the wings. In the male genitalia, T. bicuspidata and T. bifurcata are distinctive in that each branch of the uncus divides into two parts, with the inner one shorter and the outer one longer. The inner process is broad and triangular in T. bicuspidata , but slender and spur-like in T. bifurcata , and the outer process is longer and curved outwards in the former but shorter and curved inwards in the latter. In addition, the ventral plate of the gnathos is trapezoid with two digitiform processes in T. bicuspidata but nearly butterfly-shaped with two broad processes in T. bifurcata .

Material examined. Holotype: ♂, CHINA, Hainan: Wuzhishan, Shuiman , 3.IV.2008, coll. Lang Songyun ( IZCAS) . Paratypes: Hainan: 1♀, Wuzhishan, Shuiman , 730–900 m, 10. V.2007, coll. Han Hongxiang ; 1♂, Wuzhishan, Shuiman , 732 m, 8–9.XII.2007, coll. Li Jing ; 5♂, Wuzhishan, Shuiman , 1–3.IV.2008, coll. Lang Songyun ; 1♂, Diaoluoshan , 929 m, 11–12.XII.2007, coll. Li Jing ; 1♂, Baisha, Yinggeling , 434 m, 5.IV.2008, coll. Lang Songyun ; 2♂, Baisha, Yinggeling , 248–429 m, 16–20.XI.2008, coll. Li Jing ( IZCAS) .

Etymology. The species name is derived from the Latin word bicuspidatus which means double pointed, referring to the bifurcate uncus.

Distribution. China (Hainan).