Bioacoustics of Homogryllacris eremna

( Figure 1 ) Description. General. Body medium-sized for this genus. Fastigium verticis about two times as broad as scape, apex truncate ( Fig. 1C ). Eyes ovoid, ocelli indistinct, oval ( Fig. 1A–B ). Pronotum subquadrate, anterior margin slightly protruding forward, posterior margin almost straight ( Fig. 1B–C ). Lateral areas of second and third abdominal tergites each with two rows of stridulatory pegs. Tegmina reaching anterior margin of first abdominal tergite, hind wings slightly longer than tegmina ( Fig. 1B ). Legs. Fore coxa with a spine. Fore and middle femora unarmed on ventral surfaces; fore and middle tibiae with 4 pairs of long spines and a pair of short apical spurs on ventral surfaces respectively. Hind femur with 4–7 inner spines and 3–6 outer spines on ventral surface; hind tibia with 5 spines on both sides of dorsal surface, with a pair of apical spurs on dorsal surface; ventral surface with a long apical spur on inner margin, near basal area strongly curved dorsad, while outer margin with 2 apical spurs, with a pair of pre-apical spurs. Male. Genitalia. Ninth abdominal tergite slightly curved ventrad. Tenth abdominal tergite narrow and short, the middle of posterior margin with a pair of long processes which crossed near base and pointed outwards, the middle area of these processed markedly stout, apical halves incurved throughout, apices observably sclerotized and curved ventrad, tips acute ( Fig. 1D–F ). Cerci relatively short, apices rounded. Subgenital plate subquadrate, the middle of anterior margin covered by the previous abdominal tergite, posterior margin with a wide triangular notch, subapices of lateral lobes slightly concave, while apices rounded and protruding backwards ( Fig. 1D–E ). Styli cylindrical and long, apices rounded, inserted on lateral margins of subapical area of subgenital plate. Coloration. Body dark brown. Fastigium verticis and occiput with broad and irregular dark brown stripe, frons with two dark brown spots ( Fig. 1C ). Eyes black, lamellar uplift on inner margin of antennal scrobe black ( Fig. 1A– C ). Pronotum with black rim, disc almost dark brown but lateral lobes light ( Fig. 1B–C ). Tegmen with dark brown veins. Mesonotum, metanotum and dorsal surface of abdomen black. All spines and spurs of legs dark brown. Female. Body larger than male, see below. Subgenital plate nearly trapezoidal, basal area broad, then narrowing, basal half with thin transverse folds, apical half marked narrower, posterior margin faintly concave ( Fig. 1H ). Ovipositor thin and long, straight, dorsal and ventral margins almost parallel, apex broken ( Fig. 1G ).