Bioacoustics of Aancistroger elbenioides

Description. Small to medium sized species. Face narrow ovoid; forehead nearly smooth; fastigium verticis little wider than scapus; ocelli visible but little distinct ( Fig. 32B ). Abdominal tergites two and three each with two rows of stridulatory pegs (10–12, 16–19; 19, 26; n = 2 males ). Wings reaching or surpassing stretched hind tibiae ( Fig. 34A ). Tegmen ( Fig. 32A ): Radius with two branches, both forked near tip; media anterior sub-fused in basal quarter with radius (veins attached to each other, but recognizable as two veins); cubitus anterior at base single branched, after division into two branches, the anterior branch makes a curvature and receives a short connection branch from MA, shortly after it divides into MP and CuA1, which are running parallel; CuA2 without further division; cubitus posterior undivided, free throughout; with 3–4 anal veins, the last branch short, arising from a common stem with preceding branch. Legs: Fore coxa with a small 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 6–8 external and 5–6 internal spines on ventral margins; hind tibia with spaced spines on both dorsal margins, ventral margins with one preapical spine; with 3 apical spurs on both sides; dorso-internal apical spur ♀ 13:9 (= 1.44x), ♂ 13:9.5 (= 1.37x) times longer than dorso-external spur ( Fig. 34C ). Coloration. General color uniformly yellowish brown; abdominal tergites greyish red. Face uniformly yellowish or greyish brown; compound eyes black. Tegmen semitransparent yellow, along fore and hind margins whitish; veins yellow; hind wing semitransparent white; veins yellow, cross-veins pale. Male. Eighth abdominal tergite of normal length. Ninth abdominal tergite not globular, only lateral margins curved ventrad; red; apical margin in middle subtruncate, faintly bi-concave; on both sides with a long downcurved spine that is at base wide and round and light yellow, in apical two thirds compressed and dark brown; tip acute ( Figs. 33 G–H). Tenth abdominal tergite almost hidden beneath ninth tergite; largely membranous except for areas around bases of cerci. Epiproct semi-circular with wide median groove; paraproctes compressed, setose on apical surface. Subgenital plate little wider than long, with medial furrow, lateral margins convex, not approaching, apical margin subtruncate; styli fused with subgenital plate, visible as short cones at apico-lateral angles of plate ( Fig. 33I ). Female. Seventh abdominal sternite with oval, marginated groove at very base; otherwise of normal shape. Subgenital plate separated by a rather short membranous area from preceding sternite; with convex lateral margins and concave apical margin; surface flat in middle, upcurved on both sides ( Fig. 34B ). Base of ovipositor normal. Ovipositor rather short, substraight but with convex dorsal and concave ventral margin; tip subobtuse ( Fig. 34A ). Measurements ( 2 males , 2 females ).—body w/wings: male 31, female 36; body w/o wings: male 16–17, female 20–21; pronotum: male 3.0–3.5, female 3.3–3.5; tegmen: male 26.5–27.0, female 29.0–29.5; tegmen width: male 8, female 8; hind femur: male 8.5, female 10.0–10.5; antenna: male 80–90; ovipositor: female 10.5 mm .