Bioacoustics of Triaenogryllacris

Redescription. Medium-sized (body length 19-22 mm ) ( Fig. 1A , 4A ). Coloration . Body pink, green, or yellowish ( Fig. 1-6 ). Head completely black ( Fig. 1B , 6A ) or reddish ( Fig. 4D ); central ocellus white, red or pink ( Fig. 2B , 3B , 4D , 6A ). Tegmina whitish, with red veins and hind wings hyaline, with red to brownish veins ( Fig. 1A ). Head. Space between antennal sockets 1.5 times the wider than the antennal scape; median ocellus as a large spot; maxillary palps elongated with the last segment slightly dilated at the apex; labial palpi robust, the last segment noticeably dilated in a scalene triangle shape and with a truncated apex ( Fig. 1B , 4D , 6A ). Thorax. Pronotum narrow and smooth, with quadrangular pronotal disc and rectangular lateral lobes; auditory spiracle below the lower margin of the lateral lobe of the pronotum and armed with a conspicuous spine ( Fig. 4 B-C, 6B-C). Propleuron armed with a conspicuous and stout spine ( Fig. 4D , 6 A-B). Legs. All coxae without spines or tubercles. Fore and mid femora unarmed; hind femur with spines on both ventral edges. Fore and middle tibiae, except the terminal spines, with four pairs of spines. Both sides of hind tibiae are very similarly armed (normally), with three spines on both dorsal edges; ventral edges unarmed. Wings. Well developed, slightly projecting beyond hind knees ( Fig. 4 A-B). Tegmina with five anal longitudinal veins (post-cubital veins sensu Karny, 1937 ). Media vein (M) originating from radius stem, appears as the first branch of radius. Hind wings with Rs vein without connection to M vein, only originating at the beginning of the apical third of R, which bifurcates once ( Fig. 1A ). Abdomen. Stridulatory apparatus poorly developed. Male. Ninth and tenth abdominal tergite unmodified, sclerotized hooks present between the paraprocts and ventral edge of the tenth tergite, the area between the hooks membranous ( Fig. 5 A-B). Cerci simple without branches. Subgenital plate posteriorly with three or two acute median processes, without styli ( Fig. 1D , 5 D-F). Female. Subgenital plate posteriorly emarginated and slightly narrower than its base, sternite preceding the subgenital plate with a papilla on each side ( Fig. 6 D-E). Ovipositor longer than the hind femur, tip semicircularly rounded ( Fig. 6F ).