Bioacoustics of Radigryllacris nigriabdominis

Wings considerably surpassing apices of hind femora ( Fig. 9E–F ). Tegmen ( Fig. 2 ): Media arises from R in middle area, R forked near tip. Cubitus anterior forks into two branches, CuA1 and CuA2; cubitus posterior free, undivided. With 4 anal veins, the last two with common base. Hind wings slightly longer than tegmina. Fore coxae with a small spine. Fore and middle femora ventrally unarmed; tibiae with 4 pairs of spurs and 1 pair of apical spurs on ventral surfaces. Middle tibiae with 1 dorsal spine on internal margin. Hind femora with 2–3 internal and 4–7 external ventral spines; tibiae with 6 pairs of dorsal spines, these becoming larger apically; ventral surface of tibiae with 1 pair of subapical spurs, apices with 1 pair of dorsal spurs and 2 pairs of ventral spurs. Second and third abdominal tergites with two rows of very minute stridulatory pegs ( Fig. 1F ). Eighth abdominal tergite prolonged ( Fig. 1H ). Ninth abdominal tergite curved downward and slightly forward, the apical half split in midline, on both sides of split area with a subtriangular tubercle and below both tubercles with 1 small compressed spine which almost straight and invisible in dorsal view ( Fig. 1I, K–L ). Cerci longer, cylindrical, nearly straight ( Fig. 1I ). Subgenital plate wider than long, anterior margin arched concave; basal area of lateral margins convex, narrowing to apex; apical area narrower than basal, posterior margin slightly obtuse-triangularly concave ( Fig. 1J ). Styli inserted laterally at posterior margin of subgenital plate. Coloration. Yellowish brown, frons greenish when alive. Cell of wings brown ( Fig. 2 ). Abdominal tergite black ( Fig. 9E–F ). Measurements (mm). Body w/wings: ♂ 38.1; body w/o wings: ♂ 28.8; pronotum: ♂ 7.1; tegmen: ♂ 26.8– 27.8; hind femur: ♂ 16.6. Female. Unknown.