Bioacoustics of Philmontis spinosus

Description. Medium sized species with wings covering abdomen but not fully reaching tip of hind knees. Face mostly of general color, antennal scrobae and first antennal segment black, vertex and occiput black; pronotum with dark brown or black lateral lobes, disc of general color; tegmen with light veins and veinlets and with light cells, dark color fades toward end of tegmen; hind femur with black genicular ring; abdominal tergites often black on both sides, brown in middle. Pronotum elongate; disc with anterior margin faintly concave, hind margin broadly rounded; lateral lobes long and narrow, its deepest point in or little before mid-length, auditory swelling distinct, without humeral sinus. Prosternal spines short to medium long; mesosternal lobes obtuse; metasternal lobes rounded. Femora with the following number of spines on ventral margins: (1) 4-6 / 4-7; (2) 2-6 / 0-3; (3) 5-10 / 0 (n = 35); hind knee lobes unispinose. Male. Stridulatory file concave or faintly sinusoidal, teeth robust but dense, in apical third narrow and very dense (n = 6): total length 1.28, 1.19, 0.93, 0.99, 0.98, 1.09 mm ; area with countable teeth 0.83, 0.99, 0.71, 0.73, 0.80, 0.86 mm with 42, 51, 36, 44, 50, 41 teeth; from base to end of distinct area 0.83, 0.92, 0.71, 0.72, 0.69, 0.86 mm with 44, 37, 36, 40, 34, 40 teeth; area with distinctly spaced, including largest teeth 0.68, 0.75, 0.52, 0.61, 0.61, 0.70 mm with 28, 32, 26, 32, 28, 30 teeth ( Fig. 4E ). Tenth abdominal tergite almost semi-circular in general outline with more than apical half divided into a pair of little down-curved lobes with broadly rounded ends that little approach each other while the more proximal interspace between both lobes is oval and widened; basal area of plate with a deep medial furrow that widens toward base. Cerci in dorsal view narrow cylindrical with internal surface only faintly flattened, in about apical half curved moderately mediad, in subapical area with a short process with convex apical and concave proximal surface and terminating into a short, curved spine from ventral-apical surface, while cercus stem behind process short conical also with a spine at tip ( Fig. 3A–C ). Disc of subgenital plate with convex, but toward end with concave lateral margins that terminate into long and narrow, diverging apical projections that carry long styli at tip; lateral margins of disc upcurved and then curved sideward forming compressed rims until division of plate into a pair of apical projections. Titillators in situ facing each other; when spread, with basal area semi-oval, followed by compressed, band-like stems that in apical half give rise to roughly triangular lateral projections with concave distal and convex proximal margins and with concave distal surface that is narrowing toward end which carries a sclerotized, rounded disc that is rectangularly twisted against preceding surface ( Fig. 5F ). Female. Subgenital plate with basal area markedly widened and separated from main area by a rim that is interrupted in middle; surface proximad of rim concavely excavated except along midline; basal, lateral margin in ventral view oblique on both sides but extended into roughly triangular, compressed expansions only visible in lateral view; ventral surface behind transverse rim with converging and little upcurved lateral margins, at end divided into a pair of long spine-like projections with convex external surface and subacute tip ( Figs 8F–G ). Ovipositor stout in basal area, regularly curved and narrowed toward acute tip ( Fig. 6G ). Measurements ( 17 males , 20 females ).—Body w/wings: male 26–30, female 28–36; body w/o wings: male 21–27, female 22–31; pronotum: male 7.0–9.3, female 5.8–8.0; tegmen: male 18–20, female 20–23; hind femur: male 15.5–18.0, female 16–22; antenna: male 80, female 80–90; ovipositor: female 11.5–13.0 mm.