Bioacoustics of Venatorellus

Description. Head. Eyes globose, located laterally, inserted at the level of the ventral margin of antennal sockets. Apex of antennal sockets in dorsal view shorter than half the length of eyes. Face very slender in frontal and lateral view. Vertex barely visible in frontal view; width six-tenths the length of the head. Frons subtriangular or oval, with a rounded projection at middle, where the defined ocellus is located. Face with surface smooth or slightly wrinkled. Mandibles with apex elongate and curved inwards, symmetric ( Figs. 1 C and 1F). Thorax. Pronotum with anterior and posterior margins straight or slightly concave ( Figs. 1 A and 2B). Prozona with a transverse furrow extending to the lateral lobes, not reaching the lower margin. Mesozona with a transverse furrow, extending to the lateral lobes reaching the lower margin. Metazona with a straight transverse furrow extending laterally to the lateral lobes, reaching the posterior margin. Lateral lobes with lower margin almost straight; posterior margin slightly oblique, with rounded corners and without sinus humeralis. Each sternite with two spines with rounded tips; prosternal spines comparatively slender; metasternal spines flattened or slender. Wings. Wings in both sexes fully developed. Tegmina without a bright yellowish spot at the base. Tegmina coriaceous, hind wings hyalines ( Figs. 2 A and 2B). Legs . Hind coxae with ventral margin usually bearing one basal and one distal spine, the tip of the spines can be acute or rounded. Legs slender. Hind femora with variable length. Fore- and mid femora with a wide longitudinal furrow along the ventral surface. All femora armed with long stout spines. Fore tibiae with surface close to spines similar to the remaining surface, and a small rounded pit dorsally, below and close to each tympanal opening. Mid tibiae with six ventral spines. Hind tibiae with several spines on the dorsal and ventral margins. Genicular lobes of all legs ending in an acute tip. Tympanal openings located at the dorsal surface of the tibiae, the width of each opening about one-sixth the length; ear region conspicuously inflated. Male. Tegmina. Left tegmen devoid of veins delimitating mirror; membranous mirror only in right tegmen ( Figs. 2 A and 2B). Left and right stridulatory files well developed ( Figs. 2 C and 2D). Postabdomen. Tergite X unmodified, similar to the remaining tergites. Cerci with bent apex; tubercles and bristles covering the entire surface, except the tip ( Fig. 3 A). Epiproct rounded. Subgenital plate slightly emarginated ( Fig. 3 B). Paraprocts triangular and concealing the phallus. Phallus with the titillator composed by a transversal bridge which arises from the basal portion of the dorsal lobe, and with two outward projections with rounded tips ( Figs. 3 D and 3E). Female. Postabdomen. Subgenital plate triangular, with base wider than the apical portion ( Fig. 3 C). Ovipositor slightly upcurved; upper valve about two times as wide as lower valve; apex of ovipositor acute ( Fig. 1 D).