Bioacoustics of Adapantus (Adapantus) excavatus

Description (following the concept of Naskrecki, 2008a ). General. Body of medium size (habitus Fig. 5 A ) Head. Antennae more than twice as long as body; fastigium of vertex triangular, nearly reaching apex of antennal sockets ( Fig. 7 A ), grooved dorsally; frons flat. Scapus with small apical spine. Thorax. Humeral sinus of pronotum absent; lateral lobe wider than high; upper side of pronotum concave; anterior and posterior edge of prozona convexly rounded ( Fig. 7 A ); pronotum surface weakly granulate. Prosternum armed with two short spines. Legs. Genicular lobes of front and hind femur ( Fig. 6 C ) armed with spines on both sides, mid femora with spines on inner side only; mid tibia dorsally unarmed. Wings. Tegmina distinctly surpassing apex of abdomen; left stridulatory area coriaceous, with a large cell, shaped as mirror ( Fig. 7 C ); right stridulatory area with very large mirror ( Fig. 7 D ). Stridulatory vein very thick ( Fig. 7 A, C ), stridulatory file weakly bent, flat, with ca. 135 lamelliform teeth, 3.1 mm long ( Fig. 7 B ). Hind wing as long as tegmina. Abdomen. Cercus bent in apical third; apex of cercus slightly thickened, excavated ( Fig. 6 A ); subgenital plate with small, triangular apical incision; stylus cylindrical, more than 3 times as long as wide ( Fig. 6 B ). Coloration. Coloration brown and green, sometimes mottled ( Fig. 5 A ); face light brown, without darker markings; hind wing fumose. Measurements (in mm). Body w/wings 32; body w/o wings: 29; pronotum: 5.5; tegmen: 25; hind femur: 18.