Cyana griseilinea de Joannis, 1930

(Figs 22–25, 42, 43, 54)

A. [ Cyana] griseilinea de Joannis, 1930, Annales de la Société entomologique de France, 98: 756 (Type locality: [North Vietnam] “Cha pa”).

= Cyana succincta Černý, 2016, Entomofauna, 37 (26): 427 (Type locality: “N. Vietnam, 1400m, Mai Chau, ... 40 km SE Moc Chau, 20.50’N, 104.50’E”), syn. n.

Type material examined. Photograph of the holotype (Fig. 22): male, “Cha pa | Tonkin | (Pételot)” / “Agrisius | griseilinea Joan. | Ann. Soc. ent. Fr., | 1929, 98 Suppl. p. 518 | H.T. (P. Viette X-1952).” / “Cyana | griseilinea | type ϐ J. de Joann ” / “1920 1932 | coll. L. & J. de Joannis | Muséum Paris” / red label “Holotype” / QR-code label with unique ID “ MNHN Paris | EL54136 ” (MNHN). Holotype of C. succincta (Fig. 23): male, “ N-Vietnam 1400m | Mai-chau, Urwald [jungle] | 40km SE Moc-chau | 20.05’N 104.50’E [20°05’N 104°50’E] | 07.–15.IV.1995 leg. | Sinjaev [Sinyaev] & EinhSamml [local collectors]” (MWM / ZSM); paratypes of C. succincta: 2 males, same data as holotype (CKC); 1 male, N Vietnam, 1600–1800m, Mt. Fan-si-pan (West), Cha-pa, secondary forest, 22°20’N 103°40’E, 10–30.X.1994, Sinyaev & local collectors leg., gen. prep. No. AV6469 (prepared by Volynkin) (CKC); 1 male, N Vietnam, 1600m, Mt. Fan-si-pan (North), Cha-pa, primary forest, 22°17’N 103°44’E, 20–30.IV.1995, Sinyaev & local collectors leg., gen. prep. No. GP T 326 (prepared by Černý) (CKC).

Additional material examined. VIETNAM: 1 male, Cha-pa, Tonkin, Pételot / Cyana griseilinea de Joannis paratype / Brit. Mus. 1930-605, unique ID: NHMUK010914190 (NHMUK) ; 1 male, Mai chau, 25 km S Moc chau, 1400m, 20°50’N 104°40’E, secondary forest, 14–18.XI.1994, V. Sinyaev leg., gen. prep. No.: ZSM Arct. 2019- 327 (prepared by Volynkin) (MWM / ZSM) ; 2 females, 1200m, Tuan-Giao (road from Lai chau to Hanoi), 21°35’N 103°25’E, 5–10.XI.1994, secondary vegetation, [V.] Sinyaev leg., gen. prep. No.: ZSM Arct. 2019-328 (prepared by Volynkin) (MWM / ZSM) ; 1 male, Cha-pa, 24.IV.[19]61, gen. prep. No.: ZSM Arct. 2020-114 (prepared by Volynkin) (MWM / ZSM) .

Notes. (1) In the original description of the species (de Joannis 1930), the generic combination is erroneously abbreviated as “ A. ”, probably following the genus Agrisius Walker preceding it. However, the line above the species description is as follows: “p. [22], après [after] Cyana costifimbria Wlk.:”, which clearly means that the new species is assigned by the author to the genus Cyana and its description represents an addition to the first paper in the series devoted to the Lepidoptera of Tonkin (de Joannis 1928), where other species of the genus Cyana were considered. The original type label with de Joannis handwriting “ Cyana griseilinea type ϐ J. de Joann” also confirms this conclusion. (2) The type series of C. succincta displays no differences to the holotype of C. griseilinea and originates from the same region, therefore the new synonymy is hereby established.

Diagnosis. The forewing length is 12.0–15.0 mm in males and 14.0 mm in females. Cyana griseilinea (Figs 22–25) is externally vaguely reminiscent of C. dubernardi sp. n. (Figs 20, 21) and the detailed comparison is provided above in the diagnosis of the latter species. The genitalia of both sexes of C. griseilinea (Figs 42, 43) are most similar to the externally dissimilar C. khami sp. n. (Figs 44, 45) and the comparison is provided below in the diagnosis of this species.

Distribution. Northern Vietnam (Lào Cai and Sõn La Provinces) (de Joannis, 1930; Černý 2016) (Fig. 61).