Bioacoustics of Sinagryllacris cirrhatis

Description. Male. Body large. Face with scattered impressed dots ( Fig. 1A ). Fastigium verticis about as wide as scape. Ocelli distinct. Pronotum projected slightly in the median area of anterior margin, posterior margin nearly straight; lateral lobes longer than deep ( Fig. 1B–C ). Fore coxae with 1 spine. Fore and middle femora unarmed on ventral surfaces, hind femora with 3–5 internal and 4–5 external spines on ventral surface. Fore and middle tibiae with 5 pairs of ventral spurs, including 1 pair of apical ones, middle tibiae with 1 internal spine on dorsal surface; hind tibiae with 6–7 internal and 6 external spines on dorsal surface, apices with 1 pair of dorsal spurs (the internal spine obvious longer than external one, Fig. 2E–F ), 1 pair of subapical ventral spurs and 2 pairs of ventral spurs. Wings surpassing hind knees and reaching about to apices of hind tibiae. Second and third abdominal tergites with stridulatory pegs ( Fig. 1D ). Eighth abdominal tergite slightly prolonged. Ninth abdominal tergite little prolonged, lateral margins arched narrowing, posterior margin with 1 pair of narrowly separated hooks medially, its base seems mobile and apex directing outwards ( Figs. 1E , 2A–D ). Tenth abdominal tergite narrow, interrupted medially. Cerci slender and long, semi-circularly curved, forming one circular ( Fig. 2A, C ). Subgenital plate longer than wide, lateral margins faintly convex in middle area, posterior margin obtusely triangular concave ( Fig. 1F ); small styli inserted at tip of the lateral lobes. Female. Differs from male in following characters: Cerci conical and slender ( Fig. 3E ). Seventh abdominal sternite widened, ventral surface swollen and prolonged backward in middle, its basal half roughly triangular in ventral view, apical half forming a long and stout process with slightly converging lateral margins and faintly convex apical margin, apical area obtuse in ventral view ( Fig. 4C, F ), apex curling ventrad ( Figs. 3E , 4A ) and bifurcated ( Fig. 4D, E ), the apices of lateral lobes inflated ( Fig. 4D, E ); the process converging middle area of subgenital plate ( Fig. 4F ). Membranous area between behind process of seventh abdominal sternite and basal area of subgenital plate with transverse riffles ( Fig. 4B, D ). Subgenital plate longer than wide, with converging, slightly convex lateral margins; posterior margin triangularly concave, apices of lateral lobes obtuse and swollen on ventral surface ( Fig. 4B, E ). Ovipositor of medium length, behind base moderately upcurved, margins slightly and gradually narrowing towards tip, tip rounded ( Fig. 3F ). Tegmina ( Fig. 5 ). Radius with two branches, both forked near tip. Media anterior free from base. Cubitus anterior releases an anterior branch in a curvature, after that branch receives an oblique branch from MA, then it divides into MP and CuA1, which are running parallel. CuA2 without further division. Cubitus posterior free from base, undivided. With four anal veins, the last two with common base. Coloration. Body green when alive. Apices of spines of hind legs black. Measurements (mm). Male ( holotype ): BL 20.6, PL 3.8, TL 30.2, HFL 11.3. Female: BL 18.8, PL 3.9, TL 29.7, HFL 12.5, OvL 10.2.