Eugryllacris bifoliata Bian & Shi

Bian, Xun & Shi, Fuming, 2016, Review of the genus Eugryllacris Karny, 1937 (Orthoptera: Gryllacridinae) from China, Zootaxa 4066 (4), pp. 438-450 : 445-446

Eugryllacris bifoliata Bian & Shi sp. nov.

( Fig. 5 , Map 1)

Male. Size normal for the genus. Fastigium verticis broad, about 1.3 times as broad as scape, lateral margins not raised. Scape elongate, shorter than the length of eye; pedicel and first segment of flagellum combined as long as scape. Eyes oval, obviously protruding; ocelli unconspicuous, median ocellus defined nearly circular; lateral ocelli ovoid ( Fig. 5 A). Anterior margin of pronotum slightly projected in the middle, posterior margin slightly concave; lateral lobes longer than high, ventral margin almost straight ( Fig. 5 B–C). Hind femora with 5–6 inner and 6–10 outer ventral spines. Middle tibiae with 1 inner apical spine, hind tibiae with 6–7 inner and 5–6 outer short spines on dorsal surface. Tegmina considerably surpassing apices of hind femora; hind wings slightly longer than tegmina. Ninth abdominal tergite divided in the middle, forming two lobes, the apices with 1 small hook, which visible in lateral view ( Fig. 5 D), its apical area directing backwards and slightly upwards. Cerci almost straight, cylindrical. Subgenital plate longer than broad, anterior margin almost straight, centre of posterior margin obtusetriangular concave, the lateral lobes nearly triangular ( Fig. 5 E). Styli conical, faintly incurved, shorter than the lateral lobes of subgenital plate, its apices obtuse, located on lateral margins of subgenital plate in middle area ( Fig. 5 E).

Female. Differs in following characters: more robust; dorsal surface of hind femora with 3–4 inner and 6–8 outer spines, ventral surface of hind tibiae with 6 inner and 6–7 outer spines. Posterior margin of seventh abdominal tergite with 1 short, stout median process. Posterior margin of subgenital plate with 1 median concavity, the lateral lobes obtusely rounded ( Fig. 5 L). Ovipositor longer than hind femora, strongly upcurved, dorsal valvulae with apices obliquely truncate ( Fig. 5 J–K).

Coloration. Yellowish green. Eyes brown. Mandible with black teeth ( Fig. 5 F). Dorsal surface of pronotum with 1 longitudinal yellow stripe in middle ( Figs. 5 B, G). Spines of hind legs with apices black.

Measurements (mm). BWL: ♂ 37.5–42.2, ♀ 39.6–40.5; BL: ♂ 27.0–32.0, ♀ 29.3–32.1; PL: ♂ 7.8–9.0, ♀ 8.4–9.7; TL: ♂ 28.8–32.6, ♀ 30.9–31.5; HF: ♂ 16.9–18.4, ♀ 18.3–19.0; Ov: 19.5–22.0.

Material examined. Holotype: male, Jiuwanshan, Rongshui, Guangxi, 1 August, 2006, coll. by Shi Fuming & Mao Shaoli. Paratypes: 2 males and 3 females, other data as holotype.

Distribution. China (Guangxi).

Remarks. The new species is similar to Eugryllacris longifissa Bian & Shi sp. nov., but it is easily distinguished by: hooks of male ninth abdominal tergite larger, its apices directing backwards and slightly upwards; posterior margin of male subgenital plate with 1 obtuse-triangular concavity, the lateral lobes nearly triangular ( Fig. 5 E); the process of female seventh abdominal sternite shorter and stouter than the latter.

Etymology. Name derived from the triangular lateral lobes of male subgenital plate.

Figures

FIGURE 5. Eugryllacris bifoliata Bian & Shi sp. nov. A, F. head in frontal view; B – C, G – H. head and pronotum: B, G. dorsal view, C, H. lateral view; D, J. apex of abdomen in lateral view; K. subgenital plate in lateral view: E, L. subgenital plate in ventral view; A – E. male; F – L. female.