Bioacoustics of Tenuigryllacris hainanensis

Figures 10–11 Description. Male. Body medium and slender, wings absent. Head. Face ovoid; fastigium verticis about as wide as scape, with impressed scattered dots; fastigium frontis separated from fastigium verticis by a very fine suture ( Fig. 10A ). Ocelli indistinct. Thorax. Anterior margin of pronotum faintly projecting, posterior margin concave ( Fig. 10B ); lateral lobes longer than high, anterior and posterior angles widely arched, humeral sinus indistinct ( Fig. 10C ). Fore coxae with 1 small spine. Fore and middle femora unarmed; hind femora ventrally with 4–6 internal and 1–2 external spines. Fore and middle tibiae with 4 pairs of spurs and 1 pair of apical spurs on ventral surfaces, middle tibiae with 1 internal spur on dorsal surface. Hind tibiae dorsally with 5–6 internal spines, 5 external spines and 1 pair of apical spurs, ventral surface with 1 pair of subapical spurs and 2 pairs of apical spurs. Abdomen. Second abdominal tergite with 1 short row and 1 long row stridulatory pegs; third abdominal tergite with two rows of stridulatory pegs ( Fig. 10D ). Eighth abdominal tergite faintly prolonged ( Fig. 10E ). Ninth abdominal tergite prolonged and decurved; ventral margin semi-circular, with 1 small spine on each side, its tip acute and faintly incurved ( Fig. 10H ). Subgenital plate longer than wide, roughly rectangular in ventral view; lateral margin concave; posterior margin with 1 median concavity; styli short, roughly cylindrical, inserted at lateral angles of approaching part of margins. Female. Subgenital plate long than wide, with a pair of copulatory depressions in middle on ventral surface, lateral margins faintly convex, posterior margin bilobate ( Fig. 11F ). Ovipositor short, gradually upcurved behind basal area, regularly narrowing from base to tip; tip subacute ( Fig. 11E ). Coloration. Body yellow brown with black lateral bands from pronotum to eighth abdominal tergite, in male ninth abdominal tergite completely black. Eyes black. Measurements (mm). Male: BL 17.36–19.57, PL 4.60–4.87, HFL 10.15–10.43; Female: BL 20.17–21.65, PL 5.50–5.58, HFL 10.16–11.38, OvL 9.86–9.94.