Bioacoustics of Homogryllacris nigeriabdominalis

Description. Male. The following characters are in addition to those similar Homogryllacris unicolor ’s description. Hind femora with 12–17 internal and 9–10 external spines on ventral surface; hind tibiae with 7 internal and 6–7 external spines on dorsal surface.Wings reaching the middle area of mesonotum ( Fig. 3C ). Second abdominal tergite with 1 row of large stridulatory pegs and 1 row of extremely minute stridulatory pegs, third abdominal tergite with two rows of stridulatory pegs ( Fig. 3D ). Eighth abdominal tergite prolonged to backwards and ventrad. Ninth abdominal tergite semicircular. Tenth abdominal tergite with 1 pair of longer spines which reaching the middle area of seventh abdominal sternite ( Fig. 3H ). Subgenital plate longer than wide, the lateral margins convex, posterior margin obtusely rounded with 1 small triangular concavity in middle ( Fig. 3H ); the external margins of lateral lobes longer than the internal margins. Female. Seventh abdominal tergite longer than other sterna, basal area with 1 pair of copulatory depressions ( Fig. 4G ). Intersegmental membrane between seventh sternite and subgenital plate shorter than the length of subgenital plate provided with faintly transverse folds ( Fig. 4G ). Posterior margin of subgenital plate with triangular and deeper concavity in middle ( Fig. 4G ). The average length of ovipositor about 1.14 times as long as body. Coloration. Body yellowish brown. Internal margins and ventral margins of antennal cavities black, scape with blackish rings at basal and apical areas ( Fig. 3A ). Eyes black. Pronotal disc with blackish longitudinal band which deeper at posterior margin ( Figs. 3B , 4B ); posterior margins of mesonotum and metanotum black which widened in middle; dorsal surface of abdomen black ( Fig. 6C–D ). Spines of male tenth abdominal tergite brown ( Fig. 3F ). Ovipositor brown.