Bioacoustics of Philmontis nigrofasciatus

Description. Fastigium verticis conical, in anterior area compressed, shorter than scapus; ventral margin separated by a shallow sinuosity from fastigium frontis. Pronotum shining, smooth, in apical area and along margins subrugose; in males prolonged behind; disc slightly convex with lateral angles broadly rounded, apical area indistinctly shouldered; anterior margin concave in middle; posterior margin rounded; transverse sulcus indistinct, second transverse sulcus indicated on disc; paranota much longer than high, posterior angle lying before middle of pronotum length; in females pronotum markedly shorter than in males but lateral lobes also narrow. Slightly brachypterous, tegmen about covering abdomen but not reaching hind knees, gradually narrowed toward rounded tip ( Fig. 1G ). Prosternum with two acute tubercles. Meso- and metasternal lobes rounded; medial plate without process at posterior angles. Anterior tibia in cross-section quadrangular with dorsal angles rounded. Femora with the following number of spines on ventral margins: (1) 4-6 / 2-6; (2) 4-7 / 0-2; (3) 4-8 / 0 (n = 7); hind knee lobes unispinose. Hind tibia with 1 dorsal and 2 ventral apical spurs on each side. Male stridulatory file concave or faintly sinusoidal, teeth robust but dense, in apical third narrow and very dense (n = 3): total length 1.00, 1.07, 1, 15 mm ; area with countable teeth 0.89, 0.84, 0.89 mm with 44, 38, 44 teeth; from base to end of large teeth 0.80, 0.79, 0.71 mm with 36, 38, 44 teeth; area with distinctly spaced teeth, including largest teeth 0.51, 0.56, 0.48 mm with 21, 24, 20 teeth ( Figs 4A, 4J ). Tenth abdominal tergite wider than long, hind margin wide-roundly excised in middle for about one third the length of the tergite, obtuse angularly projecting on both sides of excision. Cerci at base cylindrical, afterward from internal surface compressed and widened into a large, rounded, ventro-internal extension; external area of cercus behind that extension curved mediad and divided into a longer dorsal branch and a short ventral spine, dorsal branch at end obliquely truncate with a distinct spine at distal end and a minute spinule at proximal end ( Figs 2A–C ). Subgenital plate triangularly excised from base, afterward 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 carrying at end minute styli; epiproct triangular with rounded end, surface in middle of baso-central area caved, lateral areas swollen. Titillators long and narrow, basal area hyaline, expanded apico-laterad; afterward narrow parallel-sided, in about mid-length moderately widened and curved, toward end curved again and at end provided with a sclerotized disc twisted against main titillator axis; surface of titillators largely hyaline, surface of widened area with light brown striation and scattered small brownish spots ( Fig. 5A ). Female subgenital plate in basal area little wider than last sternite, with a faint medial carinula; little behind anterior margin with a step and laterally widened into dorso-lateral expansions with obtuse end, thereafter with parallel lateral margins; basal area at end sub-truncate in middle but on both sides prolonged into little compressed, faintly sinusoidal projections that are longer than the basal disc and at end narrowing toward obtuse tip ( Figs 7A–B ). Ovipositor moderately long, in little more than basal third stout, afterward regularly upcurved and narrowed to acute tip ( Fig. 6A ). Measurements ( 4 males , 3 females ).—Body w/o wings: male 20.0–20.5, female 19.0–24.0; pronotum: male 7.9–8.3, female 6.2–6.5; tegmen: male 13.0–14.5, female 15.0–18.0; hind femur: male 12.5–14.5, female 13.5– 14.5; ovipositor: female 10.0 mm.