Bioacoustics of Metallacantha

Description COLORATION ( Figs 17–19 ). Generally green, with a lateral whitish stripe. HEAD ( Fig 11 ). Fastigium of verteX laterally flattened, eyes globular. Frons, clypeus, and genae slightly rugose. Frons straight, junction with genae divided by a vertical and straight keel, in frontal view. Antennae around 5–6× longer than anterior femur. THORAX ( Figs 2–3A , 5–6A , 10 , 11B–C , 12 , 15A, C–E ). Robust, slightly tapering from the posterior area towards the anterior margin. Pronotal disc ( Figs 3A , 11B , 15C ) anteriorly and laterally gently round, metazona moderately elevated; pronotum slightly tapering towards anterior region. Basisterna bearing two spines paramedial each, gradually increasing in size from pro to metabasisternum ( Figs 5C , 12B , 15E ). WINGS ( Figs 2 , 6 , 10 , 12A, C , 16 ). Distally acuminated with apex round and gently inwardly curved in the anterior edge; posterior margin suboval, anterior margin slightly sinuous near apex. Bearing relatively small, irregularly shaped cells. Vein C weak. Veins Sc and R strong, extending towards the tip; both parallel and very close to each other. Vein M contiguous with MP, strong and curved, and MA weaker and sinuous. Membranous wing hyaline, triangular, reduced, unspotted. Male stridulatory area ( Fig. 3B–E ). Triangular, file with delicate stridulatory teeth similar to a zipper strip, with up to hundreds of wide, sharp, and minute teeth; mirror elliptical to almost round, asymmetric at the sides; scraper straight and sharp. LEGS ( Figs 2 , 5 , 7A , 10 , 13 , 15A, F–H ). Robust and large in relation to the body, with hind legs around twice the length of the body. Tympanum shown as a narrow slit. All femora bearing rows of conical or triangular porrect spines, two dorsally and two ventrally. Pro- and meta-tibiae bearing few spines. Hind legs very thick. Metatibiae extremely thorny ( Fig. 13A–E ). Dorsally with an anterior row of seven slightly porrect, large, laterally flattened, widened triangular spines with blackish and iridescent ventral surfaces – the proximal three very large, the central one medium to small, and the distal three small and narrower, close to each other and near apex. Dorsally, with a further posterior row of around seven spines, the first four large, somewhat triangular, thorny, thin, long, and slightly sinuous. Ventrally with single row of several spines on the anterior edge, all except the last thin, long, and inwardly curving, those near apeXes slightly porrect; first three smaller, gradually increasing in size towards distal portion; the largest spines are those near the center of the tibiae. ABDOMEN ( Figs 4 , 7B , 14 , 15I–K ). Large, wide. Tergum X with posterior margin expanded and rounded. Subgenital plate wide, with posterior margin round in the male and indented in the female. Cerci conical, somewhat widened, strongly tapering. Male styli absent. Female ovipositor laterally flattened, long, curved, apeX widened in lateral and finely serrated in dorsal and ventral edges.