Cyana bianca (Walker, 1856)

(Figs 11, 12, 165, 238)

Bizone Bianca Walker, 1856, List of the Specimens of Lepidopterous Insects in the Collection of the British Museum 7: 1684 (Type locality: “Hindostan”).

Type material examined. Holotype (by monotypy) (Figs 11, 165): male, “Hind[ostan]” / “ Bizone bianca type Walk.” / “ Bianca n.” / “Type” / “226” / “501” / “A. Walker’s type of Bizone bianca 7-1684” / “TYPE (printed) LEP.: No. 429 Bizone bianca Walker (handwritten) HOPE DEPT. OXFORD (printed)” (Coll. OUMNH).

Other material examined. MEGHALAYA: 1 ♂, India, Meghalaya, Dangar, 30.VIII.2014, leg. H.S. Datta (Coll. NZCZSI) ; 2 ♀, NE India, W Meghalaya, Umran, 33 km N Shillong, 26°06’N, 92°23’E, 800 m, 14–23.VII.1997, leg. Sinjaev & Afonin, slide ZSM Arct. 2019 - 332 ♀ Volynkin (Coll. MWM / ZSM) .

Diagnosis. Forewing length is 13–14 mm in males and 18–18.5 mm in females. Cyana bianca is most similar externally to C. juliettae (illustrated by Volynkin & Černý (2019b): fig. 2) and C. carmina (Figs 13, 14), but can be distinguished by the black outer margin of its antemedial line being arcuate, while in C. juliettae and C. carmina that is curved outwards at the anal wing margin. In addition, in C. bianca this margin is stronger curved at costa than that of C. carmina . In the male genital capsule, the valva apex is slightly broader than that of C. juliettae (illustrated by Volynkin & Černý (2019b): fig. 14) and C. carmina (Figs 166, 167). The vesica shape of C. bianca is most similar to that of C. carmina, but differs by its smaller dorsal medial diverticulum, narrower dorsal distal diverticulum covered with weaker spinules and granulation, larger apical diverticulum, smaller lateral diverticulum bearing narrower cluster of smaller spinules, and less granulated ventral distal diverticulum bearing smaller patch of spinules. The female genitalia of C. bianca are similar to those of C. carmina (Figs 239, 240), but differ by the longer apophyses anteriores and longer sclerotized anterior section of ductus bursae.

Distribution. India (Meghalaya) (Walker 1856; Volynkin & Černý 2019b).