Diduga bispinosa Bayarsaikhan & Bae, n. sp.

(Figs. 4, 11)

Type materials. Holotype: 1 ♂, Koh Kong mountain area, Koh Kong Prov. (N11˚41′44.9″, E103˚06′51.8″), 25.XII.2014 (YS Bae, YD Ju, MJ Qi, U Bayarsaikhan, BS Park, SM Na, JW Kim, DJ Lee), Gen. Slide No. INU˗1415C. Paratype: 1 ♂, Pursat, Pursat Prov. (N12˚05′34.2″, E103˚11′10.1″), 4.V.2010 (YS Bae, XV Le, DY Chae), Gen. Slide No. INU˗1414C .

Diagnosis. By the wing pattern, the new species is similar to Diduga barlowi Holloway, 2001 (Holloway 2001: 449˗450, pl. 8: 43, fig. 448; present paper: figs. 5, 14), but the male genitalia structure of both species are significantly different: apex of valva with an asymmetrical projection in lower angle; upper angle of valva roundly angled; saccus narrowly “U”˗shaped, almost same length with uncus; aedeagus with two slender spine˗shaped cornuti (Fig. 11). In D. barlowi, apex of valva with large, less than asymmetrical projection in upper and lower angles; saccus broadly “U”˗shaped, almost two times shorter than uncus; aedeagus with a small spine˗shaped cornutus (Fig. 14).

Description. Adult (Fig. 4). Length of forewing 4˗5 mm in male. Head, patagium and tegula deep yellow. Thorax deep yellow, except dark brown second half. Forewing ground color dark brown (dark brown patch looks irregularly “Z” or “S”˗shaped), with deep yellow margin from basal to tornus, which hind border of margin broadly dentate in basal half of costal area and tornus; with several small, dark brown dots in deep yellow margin; cilia deep yellow. Hindwing ground color gray, tinged with pale brown; cilia pale brown. Abdomen brown, with deep yellow tuft.

Male genitalia (Fig. 11). Uncus slender, waved, with strongly hook˗shaped apex. Tegumen triangular, weakly sclerotized. Valva short, rectangular, weakly sclerotized, with a stout, asymmetrical process (almost same length with valva) in lower angle of apex; process of left valva almost straight, tubular, with short, subapical and medial spines; process of right valva stout, weakly sickle˗shaped, with an apical spine and a large medial branch pointed, with an arch˗shaped process in inward. Juxta trapezoid, weakly sclerotized. Saccus “U”˗shaped, almost same length with uncus. Aedeagus slender, “S”˗shaped, weakly sclerotized and vesica with two slender spine˗shaped cornuti.

Female genitalia. Unknown.

Distribution. Cambodia (Koh Kong, Pursat provinces).

Etymology. The specific epithet is derived from the Latin “ bi ” meaning “twice” and “ spinos ” meaning “thorny”, refers to the two process of the left valva in the male genitalia.