Bioacoustics of Glennagraecia curvata

Description. Rather small species with strongly reduced tegmina, in male reduced to stridulatory apparatus, in female to scales; face about oval with subsmooth surface; fastigium verticis conical, not very long; vertex with irregular furrows; pronotum prolonged in male with rounded hind margin, in female of normal length with subtruncate hind margin; disc with transverse furrows indistinct; lateral lobes rather low, ventral margin in anterior area concave, followed by a projecting rounded lobe, in male in about mid-length of pronotum, in female behind it ( Figs. 9A, D ). Prosternal spines absent in male, minute in female. Femora with the following number of spines on ventral margins: fore femur 3–5 anterior, 4–5 posterior; mid femur 4–6 anterior, 0–2 posterior near base; hind femur 5–6 anterior, 0–2 posterior. Hind knee lobes with one spine on both sides. Male. Fastigium verticis before eyes 0.8 mm ; fastigium verticis from base 1.0 mm; dorsal eye length 0.9 mm ; greatest diameter of eye 0.9 mm ; index fastigium verticis from base: eye length 1.1; index fastigium verticis from base: greatest eye diameter 1.1. Stridulatory file slightly curved in basal and apical areas; teeth narrow and moderately dense, near apex indistinct: total file length 1.23 mm with 89 teeth; area with large teeth 0.77 mm with 50 teeth ( Fig. 9E ); mirror oval; 1.5 mm long 1.1 mm wide; index length: width 1.3. Tenth abdominal tergite rather wide and short; apical margin on both sides faintly convex, in middle widely concave ( Fig. 9C ). Cerci at very base rather wide and conical, afterward laterally compressed with convex external and flattened or slightly concave internal surface that is nearly re-curved around mid-length, in apical area little widening to a roughly oval area carrying four stout spines along dorsal margin, followed by the obtuse tip; convex external surface of apical area with three rows of smaller spines ( Fig. 9F ). Subgenital plate with convex lateral margins; central disc with obtuse, nearly parallel, and straight lateral margins; apical margin rounded-angularly excised, provided with a pair of narrow styli. Phallus with titillators compressed, probably folded when at rest, curved laterally when opened; apical area widened, about oval with streaky-haired surface; at ventral-distal side with a widened rim, carrying a few compressed projecting pads; near apical area, separated by membrane, with a pair of about oval sclerites having the surface curved lateral ( Figs. 9G–H ). Female subgenital plate complex ( Fig. 9B ): central disc with convex surface, anterior margin angularly excised, in about basal half with a narrow furrow, apical area divided into a pair of obtuse lobes, angularly excised in between; proximo-lateral margins of disc concavely excised with concave lateral surface forming a small obtuse cone at tip; from both of the concave basal-lateral areas and connected by a membranous zone with a huge expansion with three lateral angles separating 3 surfaces: proximal surface obtuse and faintly convex, distal anterior and posterior surfaces between lateral angles strongly concave (but might be collapsed in the dried specimen) with a medial furrow. Ovipositor stout; dorsal margin concave in about basal half, straight in about apical half; ventral margin curved throughout; tip sub-acute ( Fig. 9A ). Coloration of dried specimens uniformly light yellowish brown with a black spot at face and with a black band along midline of abdominal tergites that is angularly widening laterally in about middle of each tergite and narrowing towards both ends of each tergite; antennae with wide and little conspicuous black annulation; fore and mid tibiae with 4–5 black spots on anterior and lateral surfaces; in male also dorsal surface of penultimate segment of fore and mid tarsi black. Measurements ( 1 male , 1 female ).—body: male 20, female 17.5; pronotum: male 8, female 6.5; tegmen: male 2.6; hind femur: male 12.9, female 12 mm ; ovipositor female 12.0 mm.