Bioacoustics of Anancistrogera genualis

Description. Small to medium sized species. Head: Face ovoid; forehead nearly smooth, in middle with very fine indistinct transverse riffles; fastigium verticis little wider than scapus; ocelli indistinct; fastigium frontis separated from fastigium verticis by a very fine suture; subocular furrows weak ( Fig. 42E ). Abdominal tergites two and three each with rows of stridulatory pegs (?, 4; 6, 6; n = 1 female ). Wings reaching hind knees ( Fig. 42A ). Tegmen ( Fig. 42D ): Radius with two branches, both forked near tip; media anterior free at very base, then in about basal half fused with radius with fused area markedly thickened, free apical area undivided; cubitus anterior single-branched at base, later forks into two veins; cubitus posterior undivided, free throughout; with 4 anal veins. 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; spines not very long; hind femur with 8–10 external and 9–11 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 brown; vertex with 2 small black spots, pronotum black with a small spot at anterior and a wide spot at posterior margin light brown; legs brown with genicular areas black. Face uniformly brown, only at ventro-internal angle of antennal scrobae with a black spot. Tegmen semi-transparent brownish, towards base darker; veins brown; hind wing semi-transparent white, veins brown to dark brown, cross veins in central area nearly black. Male. The male differs from A. genualis sensu Gorochov (2005) by the absence of projections from apical area of ninth abdominal tergite, instead the surface is smooth and the ventral apical margin is slightly convex in middle and little concave on both sides ( Fig. 42C ). The tenth abdominal tergite is very narrow, of light color and entire, faint angularly projecting in middle; on its ventral margin there might be a pair of short black projections. But for proofing this with certainty, the specimen has to be relaxed and the subgenital plate opened thus that the hidden part of the abdominal apex can be studied more precisely. Color pattern and venation of tegmen agree with those of the female from Khao Chong. Subgenital plate wider than long; apical margin slightly bilobate; rather short styli inserted at apico-lateral angles ( Fig. 42B ). Female. Seventh abdominal sternite of normal shape; but intersegmental membrane between seventh sternite and subgenital plate little prolonged and provided with a small, semi-oval sclerite covering base of subgenital plate ( Fig. 42G ). Subgenital plate semi-oval, wider than long. Base of ovipositor normal. Ovipositor moderately long, regularly curved with converging margins; tip subacute ( Fig. 42F ). Measurements ( 1 female ).—body w/wings: 29; body w/o wings: 24; pronotum: 4.5; tegmen: 19; tegmen width: 6.5; hind femur: 14; antenna: 160; ovipositor: 11 mm .