Bioacoustics of Thyestetha carbonaria

Redescription. Lectotype , male. Length. Pronotum + elytra: 4.6 mm . Color. Antenna, rostrum and tarsi ferruginous; pronotum black; head, elytra, pleural sclerites, legs and ventral surface dark ferruginous, almost black. Habitus subovate, in dorsal view almost without constriction between pronotum and elytra ( Fig. 1 ); profile dorsally with shallow constriction between pronotum and elytron ( Fig. 10 ). Rostrum 5.6 X as long as wide at base; base coarsely punctate, base dorsally with scattered scales. Head. Vertex coarsely punctate, few white scales near eye. Prothorax 1.2 X wider than long; disc uniformly densely punctate with small punctures, basally slightly sparser, punctures slightly smaller near pronotal base (in front of basal row of coarse punctures), interstices smooth, polished; sides densely punctate with larger punctures; postocular lobe foveate-rugose; marginal carina externally along edge with few whitish scales; rostral canal with scattered long setae and between procoxae with whitish scales. Elytra as long as wide; sides rounded; apex slightly extended, jointly rounded; punctures of striae 1–9 distinctly impressed from base to apex; interstices between punctures 2– 4 X wider than diameter of punctures, punctures closer to each other apically, interstices between punctures of stria 9 ca. 0.5 X diameter of puncture. Metanepisternum 2.8 X wider than high. Thoracic venter. Meso- and metaventrite laterally with sparse whitish scales; metaventrite submedially behind mesocoxa with pair of moderate protrusions. Pro- and mesocoxa densely punctate, squamose; metacoxa with scales near femoral insertion; trochanter with sparse, coarse punctures containing small scales. Distance between mesocoxae subequal to width of mesocoxa. Legs. Femora moderately punctate, scales laterally slender, dorsally broader; metafemur with denser scaling, dorsal squamose line moderately dense; anteroventral ridges weakly developed; with posteroventral ridge in apical third abruptly ending and markedly protruding proximally (Fig. 26). Abdomen. Ventrite 1 and 2 coarsely punctate, laterally squamose, anterior margin of ventrite 2 smooth; remaining ventrites subglabrous. Terminalia. Aedeagus ( Figs. 37, 38, 43 ). Apex rounded, strongly curved ventrad, sides weakly sinuate; lateral orificial sclerites medium-sized, inner portion ca. 2 X longer than outer portion; anterior median orificial sclerite simple between 2nd and 3rd fold (as in Fig. 36 ). Dorsal contour of transfer apparatus sharply incised at middle, ventral contour angularly projecting; sclerites in basal half, dorsoventrally flattened, moderately distant, in apical half contiguous. Sclerotized part of ventral membrane extending proximad 0.82 X length of aedeagal body from insertion of apodemes. Female paralectotype . Same as lectotype except: Rostrum 5.60 X longer than wide. Prothorax 1.26 X longer than wide. Elytra 1.04 X longer than wide; extreme apex slightly more slender. Metafemur without concavity basal to stridulatory patch, posteroventral ridge not protruding. Intraspecific variation. Size: Length 4.5–4.6 mm (n=2, x = 4.6 mm ) in males. White squamose line on dorsal surface of metafemora more or less distinct.