Bioacoustics of Apterolarnaca parvospinus

Male. Body medium. Wings absent. Fastigium verticis nearly rounded, slightly projecting forward and about 2 times as broad as scape; apical area and basal area of frons with broad transverse sulcus. Eyes ovoid; ocelli inconspicuous. Pronotum nearly hexagon, anterior margin nearly straight, posterior margin somewhat retuse; lateral lobes of pronotum longer than high, humeral sinus indistinct. Mesonotum and metanotum slightly longer than first abdominal tergite. Fore coxae with 1 spine; femora unarmed; tibiae with 5 pairs of spurs (including 1 pair of apical spurs) on ventral margins. Middle femora unarmed; tibiae with 4 pairs of spurs (including 1 pair of apical spurs) on ventral margins and 1 inner upper apical spur. Hind femora with 6 inner spines and 3 outer spines on ventral margins; on dorsal margins of tibiae with 2–3 outer spines and 3 inner spines, 1 pair of dorsal apical spurs and 2 pairs of ventral apical spurs, 2 of inner spines slightly longer, the other spines on hind tibiae very small. Basal part of abdomen obviously narrow; second abdominal tergite with 2 rows of transverse stridulatory teeth on lateral margins and the anterior row very short, only 2–3 stridulatory teeth; third abdominal tergite also with 2 rows of transverse stridulatory teeth on lateral margins, both rows of stridulatory teeth long; ninth abdominal tergite curved downwards, cuculliform, split into 2 lateral lobes by narrow membranous area, which bearing hook on apices, the hooks pointing downwards with apices slightly curved inside. Subgenital plate without styli, broader than long, split into 2 lateral lobes at apex, apical part of lateral lobes with short digitate processes. Cerci short, conical. Body yellowish brown. Eyes black; occiput with 1 semicircular black transverse stripe, but split in middle; fastigium verticis with 3 transverse stripe and 1 black middle stripe reaching apex of frons, frons with 1 pair of black vertical stripes beneath antennal foveolae; apex of clypeus with 1 pair of blackish spots; apical part of mandibles black; inner margins of antennal foveolae and inner part of scapes with black spots, antennal blackish except scape and pedicel. Pronotum, mesonotum and metanotum with black margins, in the middle with 1 black vertical stripe, the black stripe with pale midline. Basal area and apical area of tibiae, spines on fore coxae, spines on hind legs, fine spots at bases of spines on hind tibiae, all black. Apices of hooks on ninth abdominal tergite blackish brown. Female. Not seen specimens. Measurements(mm). Body: 320.0; pronotum: 33.7; hind femora: 38.6.