Cyana bianca (Walker, 1856)

(Pl. 2: 7a, 7b; 3: 7; 5: 7)

Bizone bianca Walker, 1856, List. Spec. Lepid. Insects Colln. Br. Mus. 7: 1684. TL: India (Hindostan). Cyana bianca: Hampson, 1894, Moths Ind., 2: 58; Černy & Pinratana, 2009, 6: 41, pl. 6: 81. Chionaema bianca: Hampson, 1900, Cat. Lep. Phal. Br. Mus. 2: 323, pl. 27: 8.

Chionaema bianca: Hampson, 1900, Cat. Lep. Phal. Br. Mus. 2: 323, pl. 27: 8; Draudt, 1914, 10: 174, pl. 161; Fang, 1982, 2: 205, fig. 1506.

Diagnosis. Wingspan ♂ 36–37 mm, ♀ 42–45 mm. This species shows extreme sexual dimorphism. This species is similar to C. determinata, but can be distinguished by the following characteristics: bigger size (36–37 mm); in male genitalia, valvae tapered; saccular process finger-shaped, with short apical spine, almost same length with valvae; aedeagus stout, and vesica with fields of small to large, irregular spines. In C. determinata, small size (28 mm); in male genitalia, valvae more rectangular; saccular process tapered, with sharply curved, long apical spine, slightly longer than valvae; aedeagus short, stout, and vesica with two groups of longer spines, fields of short, irregular spines, and scobination.

Material examined. 1♂, Cambodia, Samkos (N12˚12′41″, E102˚54′37″), 17.II.2012 (Y.S. Bae et al.); 3♂, 3♀, Cambodia, Samkos (N12˚12′41″, E102˚54′38″), 19–21.VII.2012 (Y.S. Bae et al.), Gen. Slide No. INU-1090, INU- 1091.

Distribution. Cambodia (Samkos), India, Myanmar, Thailand, Vietnam, China.

Remarks. This species was reported from Cambodia by Candѐze (1927).