Bioacoustics of Phryganogryllacris nigra

Figures 1–2 Description. Male. Body medium. Head. Face ovoid with impressed scattered dots; fastigium verticis about two times as wide as scapes, separated by a very fine suture from fastigium frontis ( Fig. 1A ). Ocelli distinct, median ocellus slightly larger than lateral ocelli ( Fig. 1A ). Anterior margin of pronotum faintly projecting in middle, posterior margin nearly straight ( Fig. 1B ); lateral lobes longer than high, anterior angle widely rounded, posterior angle rounded angular, ventral margin undulant, humeral sinus shallow ( Fig. 1C ). Legs . Fore coxae with 1 small spine; fore and middle femora unarmed, tibiae ventrally with 4 pairs of spurs and 1 pair of apical spurs; dorsal surface of middle tibiae with 1 internal spine. Hind femora with 4–5 internal and 3–8 external spines on ventral surface; dorsal surface of tibiae with 6 pairs of spines, apices with 1 pair of dorsal spurs (the internal apical spur longer than external one) and 2 pairs of ventral spurs, ventral surface with 1 pair of apical spurs ( Fig. 2E ). Tegmina and wings. Tegmina and wings longer, slightly surpassing the hind leg ( Fig. 2E ); hind wings slightly longer than tegmina. Tegmen ( Fig. 2A, B ): Radius with two branches, both forked near tip; media anterior free from base, but in basal area closely approached to R; cubitus anterior at base with a single branch that forks into two veins in about basal fourth, the anterior branch makes a curvature and receives a very short oblique connection vein from MA and shortly after divides again into two parallel branches, MP and CuA1, while the posterior branch (CuA2) does not divide further; cubitus posterior undivided, free throughout; with 4 anal veins, the last two with a common stem. Abdomen. Second and third abdominal tergites each with two rows of stridulatory pegs ( Fig. 1D ). Eighth abdominal tergite prolonged. Ninth abdominal tergite prolonged, strongly bent down from dorsal surface, vaulted in lateral view ( Fig. 1E ); ventral margin arched ( Fig. 1G ); baso-lateral surface on both sides with a rather large acute process, which curved outward from middle area ( Fig. 1H ). Tenth abdominal tergite transverse, with 1 tubercular process in middle ( Fig. 1J ). Subgenital plate wider than long; basal margin straight, lateral margins convex on baso-lateral areas and then converging; posterior margin with a U-shaped concavity, the lateral lobes with internal margin shorter than external margin, apical margin obliquely ( Fig. 1L ). Styli short and depressed, apices truncate, inserted at apico-lateral margins of subgenital plate. Female. Unknown. Coloration. Body black. Fastigium verticis and fastigium frontis yellowish brown. Ocelli yellow. All tarsi yellow brown. Wings blackish. Pleura reddish yellow. Sterna with a longitudinal yellow stripe along the midline. Measurements (mm). Male: BL 24.40, PL 5.50, TL 35.53, HFL 15.16.