Promalactis bicornuta Wang, sp. nov.

(Figs 5, 27)

Type material. CHINA, Guizhou: Holotype ♂, Xiasi Village, Kuankuoshui Reserves, Suiyang County, 840 m, 9.VI.2010, leg. LL Yang, slide No. DZH10246.

Diagnosis. The new species can be distinguished from other members of the group by the large, sub-rectangular, preapical process that extends from the dorsal margin of the saccular lobe of the valva to the ventral margin of the costal lobe, and the aedeagus with a distinct apical spine-shaped process.

Description. Adult (Fig. 5). Forewing length 4.5 mm.

Head: Vertex bright leaden, occiput mottled with silvery grey. Labial palpus with first and second palpomeres dark grey on inner surface, dark brown mottled with black scales on outer surface; third palpomere black except white at base and apex. Antenna with scape white, black apically on dorsal surface, pecten dark brown; flagellum black, with white annulation on dorsal surface, dark brown on ventral surface.

Thorax: Dorsum of mesothorax and tegula ocherous brown. Forewing yellowish brown, costal margin black on basal half; markings white edged with black scales: costal spot at basal 3/5, rounded, with dense black scales anterolaterally; cell with a small spot at outer margin below costal spot; basal streak extending to base of fold; antemedian streak falcate, from dorsal 1/3 extending outward to basal 1/3 of anterior margin of cell, arched inward to basal 1/5 of cell, forming a right angle; dorsal streak from middle of dorsum extending to distal 1/4 of posterior margin of cell, continued to tornus by a black line; pretornal spot represented with a few white scales; both apical and terminal spots elliptic, encircled by dense black scales; fringe ochreous yellow except black at base of termen. Hindwing and fringe deep grey. Fore- and midlegs black, except coxa yellow, tibia with a white spot at base and middle respectively, with a tuft of white scales at apex, tarsus white at apex of basal tarsomere and on entire second tarsomere; midleg grey ventrally, black dorsally, tibia with a white spot at base, with a tuft of white scales at middle and apex, tarsus white at apices of basal two tarsomeres; hindleg yellow ventrally, black dorsally, except tarsus white at apices of basal four tarsomeres and on entire apical trasomere.

Abdomen: Male genitalia (Fig. 27). Uncus bell-shaped, broad at base, narrowed to basal 2/3, distal 1/3 slender, digitate, rounded apically. Gnathos slightly shorter than uncus; mesial plate lingulate, rounded at apex, with a membranous fine apical process, squamous in distal 1/3; basal arms approximately 1/3 length of mesial plate. Tegumen with lateral arm narrowed anteriorly, obtuse apically. Valva sub-rectangular, bilobed apically: costa slightly concave basally, produced to a apex-rounded costal lobe slightly bent ventrad distally; sacculus narrow, produced to a setose, apex-rounded saccular lobe distally, large sub-rectangular preapical process extending from its dorsal margin to ventral margin of costal lobe, with a short spine on outer margin apically. Saccus approximately 2.3 times length of uncus, wide at base, narrowed to basal 1/3, distal 2/3 slender, rounded apically. Juxta sub-elliptical, weakly sclerotized, laterally with a spine-like process at basal 1/3; basal lobe short, clubbed. Aedeagus straight, approximately 1.5 times length of valva, with a long spine-shaped process apically; with two cornuti: one cornutus slender, approximately 1/4 length of aedeagus, located medially, the other stout, approximately 1/7 length aedeagus, located distally.

Female. Unknown.

Distribution: China (Guizhou).

Etymology. The specific epithet of the new species is derived from the Latin prefix bi- and cornutus, referring to the two cornuti of the aedeagus in the male genitalia.