Bioacoustics of Otidiogryllacris

Description. Small species. Head: Face ovoid; forehead nearly smooth with scattered impressed dots and very fine riffles; fastigium verticis about as wide as scapus, separated by a suture from fastigium frontis; ocelli distinct, lateral ocelli elongate; subocular furrows present ( Fig. 25L ). Abdominal tergites two and three with stridulatory pegs. Wings covering about abdomen ( Fig. 25K ). Tegmen: Radius with radius sector branching in about mid-length of tegmen; only RS branching near tip; media fused with radius in about basal quarter, than free and unbranched; media posterior absent; cubitus anterior and cubitus posterior both single branched, free throughout; with 4 anal veins. Legs: Fore coxa with spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with four pairs of large ventral spines and one pair of smaller ventral spurs; hind femur with 9–10 external and 9 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one pre-apical spine; with 3 apical spurs on both sides. Coloration. General color light brown; pronotum with some indistinct pattern; legs with dark strokes. Face yellowish brown to medium brown; a pair of ovoid marks at base of fastigium verticis, ventral surface of scapus, and apical half of mandibles dark blackish brown. Tegmen yellowish semi-transparent; hind wing semitransparent, veins yellow. Male. Eighth abdominal tergite prolonged and down-curved at end ( Fig. 25M ). Ninth abdominal tergite with posterior area strongly bent down, deeply furrowed in midline, at ventral margin on each side of furrow with a little globular, setose swelling that carries at tip a compressed, up-bent process with swollen base and subacute tip ( Figs. 25 N–O). Epiproct small, triangular. Subgenital plate rather short with convex lateral margins and concave apical margin; styli inserted at projecting lateral angles of apical margin, rather long and straight, almost longer than length of subgenital plate; conically narrowing towards tip. Female unknown. Measurements ( 1 male ).—body w/wings: 23; body w/o wings: 20; pronotum: 4.7; tegmen: 17; tegmen width: 5.5; hind femur: 12 mm .

Description. Small species. Head: Face ovoid ( Fig. 25H ); forehead nearly smooth; fastigium verticis little wider than scapus, separated by a transverse suture from fastigium frontis; ocelli distinct, whitish. Abdominal tergites two and three without stridulatory pegs. Wings reaching to about hind knees ( Fig. 25F ). Tegmen: Radius with two branches: only RP forked once more near tip; media anterior has a common stem with radius, arising as first posterior branch of R in basal half of tegmen; media posterior absent; cubitus anterior undivided; cubitus posterior undivided, free throughout; with 5 Anal veins, the last one incomplete and with a common base with preceding vein. Legs: Fore coxa with a spine at fore margin; fore and mid femora unarmed; fore and mid tibiae with four pairs of large ventral spines and one pair of smaller ventral spurs; hind femur with 7–10 external and 3–7 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one pre-apical spine; with 3 apical spurs on both sides. Coloration. General color rather uniformly brown, pronotum with indistinctly darkened anterior area and with an elongate dark spot in middle of transient zone between disc and lateral lobes; tibiae of all legs with an indistinct dark spot about in mid-length. Face yellowish brown with a sinuate dark brown band from base of scapus and below lateral ocelli to base of scapus. Tegmen semi-transparent yellow, veins little darker; hind wing semitransparent white; veins yellow to brown. Male unknown. Female. Seventh abdominal sternite distinctly shorter than preceding sternites, followed by a long membranous zone ( Figs. 25 I–J). Subgenital plate largely membranous, only lateral and apical areas sclerotised, apical area flattened; apical margin very faintly bilobate almost truncate in middle ( Fig. 25I ). Ovipositor falcate, strongly upcurved especially in subbasal area; laterally furrowed, margins gradually approaching towards apex; the median valves of the ovipositor are laterally distinctly projecting at base between the dorsal and ventral valves; apical area slightly thickened but not widened, tip subobtuse ( Fig. 25G ). Measurements ( 1 female ).—body w/wings: 21; body w/o wings: 18; pronotum: 4.2; tegmen: 13.5; tegmen width: 5; hind femur: 11; antenna: 60; ovipositor: 8 mm .