Promalactis apicuncata Jia & Wang & Bae 2018, sp. nov.

Promalactis apicuncata Wang, sp. nov.

(Figs 4, 12, 16)

Type material. CAMBODIA: Holotype ♂, Seima (12°14'54'' N, 107°03'15''E), Keo Seima Wildlife Sanctuary, Mondulkiri Province, 16.VIII.2013, coll. Bae Y.S. et al., slide No. INU-NK15159. Paratypes: 1♂, same data as holotype, slide No. W17011 (NKU); 2♂, 1♀, 9−12.XI.2011, slide Nos. INU-NK15093 ♂, INU-NK15165 ♀, coll. Bae Y.S. et al., other same data as holotype; 1♂, Samkos (12°12'40.4 3'' N, 102°53'42.38''E), Pursat Province, 830 m, 6.II.2015, coll. Bae Y.S. et al., slide No. INU-NK15136.

Diagnosis. This new species is characterized by the forewing having an inverted irregular V-shaped tornal spot. It can be distinguished from the similar-looking species by the valva with two large ventroapical spines hooked dorsad, and with a large semicircular protuberance beyond the middle of the costa.

Description. Adult (Fig. 4) wingspan 8.5−9.0mm. Head with vertex snowy white, frons silvery gray, occiput pale reddish brown. Labial palpus with second segment yellow to brownish yellow; third segment blackish brown except white at apex. Antenna with scape white; flagellum black, dorsal surface white on basal several flagellomeres, alternated with white on remaining flagellomeres. Thorax and tegula pale reddish brown. Forewing yellow, markings white edged with black scales: basal fascia from base of fold obliquely straight outward; antemedian fascia wider, sub-parallel with basal fascia, arched outward slightly, reaching upper margin of cell; costal spot sub-rectangular, slightly narrowed posteriorly, extending from distal 2/5 obliquely outward, crossing upper corner of cell ventrally; tornal spot irregularly inverted V shaped, its outer arm large, inner arm shorter and slenderer; apical spot round; two pre-apical spots placed on termen, much smaller than apical spot; cilia yellow except gray around tornus. Hindwing and cilia deep gray. Fore- and midlegs black, fore tibia with two white dots and a small apical tuft of white scales, mid tibia with a white tuft of long scales, fore and mid tarsi white at apices of first and second tarsomeres counting from base; hindleg whitish yellow on ventral side, grayish brown on dorsal side except tarsus whitish yellow at apex of each tarsomere.

Male genitalia (Fig. 12): Uncus wide basally, narrowed distally, rounded apically. Gnathos strong, longer than uncus, trapezoidal, straight apically. Tegumen divided from about posterior 1/4, narrowed anteriorly to rounded apex, sclerotized along edges. Valva wide at base, slightly narrowed to apex; costa concave before middle, with a large semicircular protuberance from beyond middle to before apex; ventral area setose from end of sacculus to apex, produced to two large ventroapical spines hooked dorsad. Sacculus wide at base, slightly narrowed to 2/3 of ventral margin of valva. Saccus shorter than uncus, broad triangular, rounded at apex. Juxta sub-rounded; lateral lobe slender, with sparse setae. Aedeagus stout, almost as long as valva, with wrinkles distally; cornutus large, slightly shorter than half length of aedeagus, its basal 2/3 rhombic, distal 1/3 slender, with strong spines.

Female genitalia (Fig. 16): Apophyses posteriores approximately twice as long as apophyses anteriores. Sternum quadrate, with fine setae on posterior margin; tergum large, rounded on posterior margin. Ostium bursae large and rounded. Antrum strong, almost uniform. Ductus bursae membranous, coiled medially, with a wide banded sclerite extending from antrum to corpus bursae. Corpus bursae elongate ovate, granulous, with two sclerotized sub-rectangular plates of granules; signum being a large rectangular plate with granules and denticles.

Distribution. Cambodia (Mondulkiri, Pursat).

Etymology. The specific epithet is derived from the Latin apex and uncatus (hooked), referring to the hooked ventroapical spines of the valva.