Bioacoustics of Apterolarnaca xinganensis

Figures 9–12 Description. Male. Body medium. Fastigium verticis wider than scape. Face with sparse punctures ( Fig. 9A ). Ocelli indistinct. Pronotum with anterior margin slightly projecting, posterior margin faintly concave ( Fig. 9B ); lateral lobes longer than high, anterior angle rounded, posterior angle widely rounded ( Fig. 9C ). Fore coxae swollen with 1 spine ( Fig. 9C ). Fore and middle femora unarmed on ventral surfaces, hind femora with 7–10 internal and 2–5 external spines on ventral surface. Fore and middle tibiae ventrally with 4 pairs of spurs and 1 pair of apical spurs, middle tibiae with 1 internal spine on dorsal surface. Hind tibiae with 3–4 internal and 4–6 external spines on dorsal surface, apices with 1 pair of dorsal spurs and 2 pairs of ventral spurs. Second and third abdominal tergite each with two rows of stridulatory pegs ( Fig. 9D ). Posterior margin of eighth abdominal tergite arched projected in the middle area ( Fig. 9G ). Posterior margin of ninth abdominal tergite split along the middle, the lateral lobes curved downward and terminating into a spine ( Fig. 9H–I ). Tenth abdominal tergite interrupted in the middle. Cerci short, conical, its apices obtuse. Basal margin of subgenital plate almost straight, posterior margin with 1 median concavity ( Fig. 9H–I ), the lateral margins terminating into 1 short and stout process on both sides; without styli. Female. Subgenital plate wider than long, posterior margin widely arched with middle area slightly projected ( Fig. 10G ). Ovipositor short, apical half gradually upcurved; dorsal and ventral margins smooth, apices obtuse ( Fig. 10E ). Coloration. Body brownish yellow with blackish marks. Fastigium verticis, internal margins of antennal cavities and scape, flagellar segment and dorsal surface of head with blackish spots ( Figs. 9A , 10A ). Eyes black. Margins of pronotum blackish ( Figs. 9B , 10B ). Basal and apical areas of all tibiae with black rings. Spines of hind legs black.