Bioacoustics of Sphyrometopa

Description (male except where specified) Head.— Fastigium of vertex about 4 times as wide as scapus, blunt and as long as diameter of eye; fastigium of vertex continuous with fastigium of frons ( Fig. 25 B). Eyes small relative to size of head, weakly protruding. Frons weakly convex, smooth; tegumen of head weakly rugose, without traces of genal carinae; face broad. Mandibles and labrum weakly asymmetrical. Thorax and wings.— Dorsal surface of pronotum moderately rugose, flat; anterior dorsal margin straight, posterior one straight to weakly convex ( Fig. 25 C); lateral lobes with posterior angle narrowly rounded; humeral sinus weakly developed. Thoracic auditory spiracle large, elliptical, completely hidden under lateral lobe of pronotum. Prosternum armed with two thin, widely separated spines (modified basisternum); mesosternum with lateral lobes of basisterna triangular, oblique; metasternal lobes also triangular and oblique but with their bases wider than those of mesobasisterna. Tegmina in both sexes shortened, not reaching end of abdomen; tegmina oval to narrowly triangular with rounded apex ( Figs. 25 A-B); hind wings reduced, as long as 1/3 to 3/4 of tegmina. Stridulatory apparatus of male well developed; stridulatory area of left wing thickened, with dense network of secondary veinlets; stridulatory Species Tegmina Male cerci Stridulatory file femorata broadly oval, reaching 6th or 7th tergite ( Fig. 25 A) dorsal lobe of cercus always pointed, same color as remainder of cercus ( Fig. 24 E) with about 200 teeth ( Fig. 46 B) atlantica narrowly triangular, reaching 8th or 9th tergite ( Fig. 25 B) dorsal lobe of cercus usually rounded, darker than remainder of cercus ( Fig. 24 F) with about 170 teeth ( Fig. 46 B) file (vein AA 1) weakly curved ( Figs. 48 A-C), with narrow, regularly spaced teeth. Legs.— Fore coxa with an elongate, forward projecting spine dorsally. All femora unarmed dorsally; fore femora unarmed ventrally, mid and hind femora armed ventrally on anterior ventral margins with few minute spines; only posterior genicular lobes of mid and hind femora armed with short spines, remaining lobes obtuse. Fore and mid tibiae unarmed dorsally, both ventral margins with immovable, short spines; hind tibia armed on both dorsal margins but with only 2 small spines on anterior ventral margin; apex of tibia with two pairs of ventral and one pair of dorsal movable spurs. Tympanum on fore tibia bilaterally closed, tympanal slits facing forward, tympanal area only weakly swollen, with pair of small, elongated pits below tympanal slits. Abdomen.— Dorsal surface of abdominal terga smooth, unmodified. Male 10th tergite with deep apical emargination, supraanal plate small, triangular; female 10th tergite with deep, narrowly triangular incision. Male cercus unique ( Figs. 25 E-F), its base stout, with two dorsal lobes and long apical projection, curved backwards, overhanging basal part of cercus, its tip serrated ventrally; female cercus, simple, conical, but with apex distinctly attenuated. Subgenital plate of male with pair of styli, its posterior margin straight or with small, triangular emargination; female subgenital plate widely trapezoidal, its apex straight or weakly emarginated. Male concealed genitalia with inner phallic lobes strongly sclerotized, forming a pair of divergent titillators (titillators not separated from membrane); outer phallic lobes with small, sclerotized patches ( Fig. 26 C). Ovipositor short, sickle-shaped ( Fig. 25 A), very thick at base (when seen from below). Coloration.— General coloration mottled grayish-brown to dark brown ( Fig. 37 F); face with large, black patch, bordered with thin, diffused, whitish margins ( Fig. 25 B); legs mottled brown, lower half of outer pagina of hind femur black, bordered by diffused, whitish stripe; dorsal portion of abdomen usually lighter; cerci yellowishbrown with dark apical portions.