Diduga hastata Bayarsaikhan & Bae, sp. nov.

(Figs 1a, 1b, 11, 19)

Type materials. Holotype: 1♂, Laos, Bolikhamsai Prov., PKK Nat. Park (N18˚27′23.76″, E103˚03′05.15″ Alt: 470m), 4.VIII.2019 (YS Bae, MJ Qi, DJ Lee, JH Ko, TG Lee, YB Cha, CM Jang), Gen. Slide No. INU–10389L.

Paratypes. (7 ♂, 1 ♀) LAOS: 1 ♂, Bolikhamsai Prov., PKK Nat. Park (N18˚27′11.9″, E103˚03′40.5″ Alt: 429m), 27.VI.2017 (YS Bae, SM Na, DJ Lee, JH Ko, TG Lee), Gen. Slide No. INU–10139L; 1 ♂, Bolikhamsai Prov., PKK Nat. Park (N18˚27′23.76″, E103˚03′05.15″ Alt: 470m), 22.VII.2018 (YS Bae, DJ Lee, JH Ko, TG Lee, CM Jang, U Bayarsaikhan), Gen. Slide No. INU–10057L; 1 ♂, Bolikhamsai Prov., PKK Nat. Park (N18˚25′11.75″, E103˚05′12.59″ Alt: 290m), 29.VIII.2018 (YS Bae, SM Na, DJ Lee, JH Ko, TK Lee, YB Cha, CM Jang), Gen. Slide No. INU–10138L; 4 ♂, 2 f ♂ same to holotype, 2.VIII.2019 Gen. Slide No. INU–10380L, 10388L, 10411L, 10412L, 10413L.

Diagnosis. The new species has no remarkable external differences from a number of other members of the genus. The genitalia structure of the new species is similar with Diduga bayartogtokhi (Bayarsaikhan & Bae, 2019: 368, figs. 11, 17), but can be distinguished from the latter by the rod˗shaped largest one of three irregular apical projection of left valva acuminate, dentate margin; right valva with three stout, acuminate, stout rod–shaped projections; arched juxta with truncated apex and strongly sclerotized, curved apical spine in male genitalia; in female genitalia, ostial plate rounded, not divided to parts; distal half of corpus bursae covered with dense spinulose scobination. In D. bayartogtokhi, largest apical projection of left valva truncated, with asymmetrically bifurcated apex; one large, triangular process of right valva with dentated edge; reverse V–shaped juxta with rounded apex and without apical spine in male genitalia; in female genitalia, ostial plate consisting three spurs, with strongly dentated edge; corpus bursae covered with dense spinulose scobination wholly.

Description. Adult (Figs 1a, 1b). Length of forewing 5.5–6 mm in both sexes. Head and patagium deep yellow. Proximal end of tegula deep yellow, distal end dark brown. Thorax dark brown, with slender deep yellow apical band. Forewing ground color dark brown, with broad, deep yellow costal margin, which hind border broadly waved; with two dark distinct dots in antemedial and postmedial line, and small, dark brown dots in costal and terminal border; cilia deep yellow. Hindwing ground color dark brown; cilia dark brown. Abdomen brown, with deep yellow anal tuft in male. Male genitalia (Figs 11). Uncus stout, apex angular, heavily covered with setae. Tegumen triangular, weakly sclerotized. Valvae asymmetric: in left valva, narrower than right, apex rounded, membranous, with rod˗shaped spur in harpe and two costal margin’s processes, which stout upper one with diverse sized small apical spines and slender, spine˗shaped lower one broadened to basally (process of harpe almost two times longer than same sized processes of costal margin); basal area of costal margin with strongly sclerotized, weakly dentate, small arch˗shaped spur; in right valva, apex of valva with three large, stout apical processes; cucullus large, membranous, rounded apex. Juxta arched, tip strongly rectangular, with a strongly sclerotized, curved apical spine. Saccus broadly “U”˗shaped. Aedeagus stout, short, with sclerotized spine in distal half and vesica membranous, without cornutus. Female genitalia (Fig 19). Papillae anales weakly covered with setae. Lamella postvaginalis weakly sclerotized, broadly arch˗shaped; lamella antevaginalis strongly sclerotized, consisting two lateral spurs, heavily covered with short spines. Ostium bursae membranous, wrinkled. Ductus bursae membranous, with partly wrinkled, sclerotized band. Corpus bursae ovoid, weakly wrinkled, with dense spinulose scobination in basal half.

Distribution. Laos (Bolikhamsai Province).

Etymology. The species name is derived from the Latin hastatus (= halbert–headed, like the head of a halbert), referring to three large projections of right valva in male genitalia.