Bioacoustics of Elbenia fraser

Description. Habitus typical of this genus ( Fig. 5 A). Head small, with length 0.5 times (n = 1) of pronotum length. Fastigium narrowly triangular, protruding, furrowed medially, narrower than antennal scapus, with apex obtuse ( Fig. 5 B). Eye prominent. Frons smooth. Pronotum smooth, 1.5 times longer than wide (n = 1); dorsal plate with anterior margin substraight, feebly emarginated in the middle; with posterior margin rounded; lateral keel not distinct; lateral lobe 1.1 times taller than long (n = 1), ventral margin roundly angulated and posterior margin very broadly rounded. Tegmen and hind wing fully developed. Tegmen narrow basally, widens gently medially and with apex rounded. Tegminal venation as shown in Fig. 5 C: Radius Sector (Rs) originates before middle, bifurcate towards apex, running parallel to Radius. Hind wing surpassing tegmen. Anterior tibia with external and internal tympana, internal tympanum swollen and conchate, external tympanum open and oval; with 3 inner spines and 1 outer spine. Male. Stridulatory file of left tegmen elongated, about 1.9 mm (n = 1), substraight; with circa 31 teeth per mm (n = 1) densely and mostly evenly spaced throughout ( Fig. 5 D). Abdominal apex as shown in Figs. 5 E, 5F. Tenth abdominal tergite with basal part raised into a narrowly V-shaped plate; apex with two rectangular lobes from each side of the medial depression; apical lobe longer than wide, setose, apex truncated. Epiproct concealed under the prolongation of tenth abdominal tergite, apex appears broadly rounded. Cercus elongated and curved; apex rounded, with a long and curved laterally-flattened tooth ( Figs. 5 E, 5F). Subgenital plate narrow and elongated; basal margin excised, basal area tapering into narrow shaft; apex folder inward, with two roughly rounded apical lobes, narrowly emarginated at base; lobe with apex bulbous, with internal margin concave and an internal apical tooth ( Figs. 5 E, 5F). Female. Unknown. Colouration. Pale green in general. Head with vertex, dorsal part of scapus, palpi pale green; otherwise, including fastigium, ventral side of scapus, frons, mouth parts and gena bluish white. Pronotum generally pale green with tint of bluish white; dorsal plate with posterior margin brown; lateral lobe more bluish white. Tegmen green, slightly hyalinous; with basal half of anal field infumated black. Hind wing mostly hyaline, with projecting area green, not hyaline. Abdomen mostly very pale green to bluish white. Legs generally pale green, with basal half of femur more bluish white and coxa bluish white; fore femur with basal part orange; hind femur basal half with tiny black spots on dorso-external surface. Male abdominal apex pale green; base of subgenital plate bluish white; teeth at apex of cercus and apical lobes of subgenital plate dark brown. Measurements ( holotype , in mm). BL: 24.7; BWL: 48.4; PL: 4.5; PW: 3.1; TL: 38.9; HWT: 5.5; HFL: 21.5; HTL: 21.5.