Darwallia barbata Gnezdilov et Bourgoin

Gnezdilov, Vladimir M., Thierry, Bourgoin & Soulier-Perkins, Adeline, 2014, Vietnamese Issidae (Hemiptera, Fulgoroidea): new taxa, new records and new distribution data, Zootaxa 3847 (1) : -

Darwallia barbata Gnezdilov et Bourgoin sp. n.

Figs 3–8 , 22–24

Type material. Holotype, ♀, Vietnam, Khanh Hoa Province, Hòn Bà massif, 12°6.961΄΄N, 108°58.734΄΄E, 19.XI. 2013, 850 m, sweeping, Th. Bourgoin leg., “Mission Hòn Bà MNHN 2013” ( MNHN).

Description. Metope narrow, enlarged above the clypeus, with distinct median carina running from its upper margin to the metopoclypeal suture, but do not reach the last. Metopoclypeal suture relatively deep, convex. Metope with two pairs of moustach-like horizontal tubercules above the metopoclypeal suture ( Fig. 4 ). Lateral margins of metope keel-shaped. Upper margin of metope acutely angulately concave. Postclypeus flat, laterally carinated, with median groove. Anteclypeus with median triangular-shaped process (in lateral view) ( Fig. 5 ). Ocelli present. Coryphe long, narrow, with lateral margins highly elevated and keel-shaped; anterior margin angularly protruding, posterior margin acutely angularly concave ( Fig. 3 ). Pronotum short medially, with anterior margin highly elevated and keel-shaped behind the coryphe. Paradiscal fields very narrow behind the eyes. Paranotal lobes wide. Mesonotum twice as long as pronotum medially, with two short median carinae ( Fig. 3 ). Pedicel elongately cylindric. Third segment of rostrum slightly longer than second one. Fore wings wide, widely rounded apically, with narrow hypocostal plate ( Fig. 6 ). Basal cell relatively wide, oval. Subcostal area wide, with many transverse veins. Sc+R furcates closely to basal cell after short common stem. R1 multibranched (10-11 branches). R2 with 3 branches (furcates distally). M 3-5 (first furcation near to wing middle, others—distally) ( Figs 6, 7 , 24 ). CuA 3 (first furcation near to wing middle, another—distally). Between longitudinal veins there are many transverse veins. Clavus long (4/5 of whole wing length), opened (Pcu + A1 runs to the apex of clavus). Hind wings well developed, equal in length to fore wings, apparently 3-lobed. Hind tibia with 2 lateral spines distally and with 7 apical spines. First metatarsomere with 2 latero-apical and 6 intermediate spines.

Female genitalia. Hind margin of sternum VII with 2 peculiar horn-shaped processes ( Figs 8 ). Anal tube long and narrow. Gonoplacs rounded, convex.

Coloration. General coloration brown reddish or dark brown, with yellow greenish lateral parts of the head, coryphe, mesonotum medially, and II-III abdominal sternites ( Figs 22–24 ). Hind wings, abdominal sternites IV- VII, and gonoplacs dark brown. Spines, claws, and horn-shaped processes of sternum VII black.

Total length. 8.2 mm.

Etymology. Species name is derived from the Latin “barba” (mustaches) referring to horizontal tubercules above the metopoclypeal suture.

Figures

FIGURES 3 – 5. Darwallia barbata sp. n., holotype, female. 3 — head, pro-, and mesonotum, in dorsal view; 4 — face; 5 — clypeus, in lateral view.

FIGURES 6 – 9. Darwallia spp., females. 6 — D. barbata sp. n., holotype, left fore wing, in lateral view; 7 — same, right fore wing (fragment), in lateral view; 8 — same, hind margin of VI – VII sternites; 9 — D. patula (Walker), hind margins of VI – VII sternites.

FIGURES 22 – 25. Darwallia spp. 22 — D. barbata sp. n., holotype, female, in dorsal view; 23 — same, in frontal view; 24 — same, in lateral view; 25 — D. patula (Walker), male, in frontal view.