Bioacoustics of Philmontis angustus

Description. Pronotum elongate, disc with anterior margin faintly concave, posterior margin broadly rounded. Prosternal spines short; mesosternal lobes obtuse; metasternal lobes rounded. Femora with the following number of spines on ventral margins: (1) 4-6 / 3-7; (2) 4-6 / 1-3; (3) 5-10 / 0 (n = 16); hind knee lobes unispinose. Male . Stridulatory file (n = 2): total length 1.16-1.17 mm ; area with countable teeth 0.98–1.00 mm with 53–62 teeth; from base to end of distinct area 0.82–0.90 mm with 38–52 teeth; area with distinctly spaced, including largest teeth 0.43–0.49 mm with 19–21 teeth ( Figs 4B–C ). Tenth abdominal tergite wider than long, hind margin wideroundly excised in middle for about one third the length of the tergite, obtuse angularly projecting on both sides of excision ( Fig. 2D ). Cerci in about first third of straight basal area cylindrical, afterward moderately widening ventrad and with concave internal surface, then strongly narrowing into a long, at base compressed, afterward subcylindrical projection curved mediad or little medio-proximad, at end rounded and provided with two minute spinules: one at and one little before tip ( Figs 2 D–F ). Subgenital plate triangularly excised from base, with a faint medial carinula; ventral disc with converging margins that are curved dorsad and then laterad forming compressed lateral expansions with rounded margin; central disc in apical area with swollen lateral margins that are extended into long, rounded projections that carry at end minute styli. Titillators narrow throughout, curved in basal area and in apical area, at tip with a small rounded disc ( Fig. 5B ). Phallus forming a membranous fold above apical parts of titillators. Female. Subgenital plate with a very fine membranous seam along midline; at base narrow, swollen and widening into compressed and elevated lateral expansions that are widening toward both sides at subtruncate dorsal end; behind expansions plate with approaching margins, upcurved on both sides, terminating into a little concave apical margin, but on both sides prolonged into long projections with converging margins and slightly wavy surface ( Figs 7C–E ). Coloration. Vertex with fastigium verticis and bands behind eyes medium to dark brown. Abdominal tergites completely blackish brown. Postfemur with apical third (males) or hind knees only (females) blackish brown. Female subgenital plate blackish brown, lateral projections of light color: in some specimens black with yellow basal, lateral area, in others plate uniformly brown or greenish varying between specimens. Measurements ( 8 males , 10 females ).—Body w/wings: male 23–25, female 26–31; body w/o wings: male 20.0– 24.5, female 18–25; pronotum: male 7.2–10.0, female 6.2–7.8; tegmen: male 15.5–20.5, female 17.5–21.5; hind femur: male 14.5–18, female 14.8–19.0; antenna: male 82, female 70–85; ovipositor: female 10.0– 12.5 mm .