Bioacoustics of Philmontis pumilus

Description. Small species with wings covering little more than half of abdomen ( Fig. 1H ). Face of uniform color, antennal scrobae and basal segments of antennae darkened or of general color. Pronotum elongate, disc with anterior margin faintly concave, posterior margin broadly rounded; lateral lobes long and narrow, its deepest point in males just before mid-length, in females about at beginning of apical third; auditory swelling distinct; without humeral sinus. Prosternal spines absent or with a pair of minute spinules; mesosternal lobes obtuse; metasternal lobes rounded. Femora with the following number of spines on ventral margins: (1) 2-5 / 1-5 in some specimens hardly visible; (2) 3-6 / 0-3; (3) 4-6 / 0 (n = 12); hind knee lobes unispinose. Male. Stridulatory file ( Fig. 4K ): total length 1.0 mm; area with countable teeth 0.84 mm with 42 countable teeth; from base to end of distinct area 0.8 mm with 39 teeth; area with distinctly spaced, including largest teeth 0.66 mm with 30 teeth (n = 1). Tenth abdominal tergite markedly wider than long, apical margin wide-roundly excised for about half the length of the tergite. Cerci with rounded dorso-external and excavated ventro-internal surface; in about apical half narrowing from ventral margin and giving rise to a narrow, rounded and little curved internal process that is compressed at end and terminates into an oblique apical margin with a minute spinule at dorso-distal angle, while tip of cercus stem gives rise to a narrow, oblique, compressed process with a small acute spine at tip ( Fig. 3D–E ). Subgenital plate in more than basal half bowl-shaped with upcurved and roundly extended lateral areas; from base triangularly excised in middle and this area membranous, afterward ventral disc in middle with a fine carinula; lateral margins roundly swollen and little upcurved, largely surpassing concave apical margin of central disc, at tip carrying a narrow stylus each. Titillators flattened, in situ folded; in opened view with basal and apical areas directed laterad; basal areas widened with concave dorsal and convex ventral margin, narrowing toward tip; apical areas moderately widened, before end narrowed and provided at end with a sclerotized disc with very finely serrulate rim; color brownish with scattered pale brown spots ( Fig. 5I ). Female. Pronotum less prolonged than in male with ventral angle in posterior half of pronotum. Subgenital plate with little converging, markedly swollen and upcurved lateral margins that terminate into curved spine-like projections; apical margin of plate between these projections convex, in middle longer than on both sides; basal area of plate with medial keel and cross-barred surface; at very base with lateral dorsal projections that are angularly curved in about mid-length and terminate into auricular structures with grooved surface and bulging margin ( Figs 8L–M ). Ovipositor moderately long, stout at base, regularly upcurved from basal area to acute tip. Measurements ( 7 males , 5 females ).—Body w/o wings: male 17–19, female 18.5–22.0; pronotum: male 6.8– 7.7, female 6.0–6.5; tegmen: male 7.5–9.0, female 8.0–10.5; hind femur: male 9.0–10.5, female 10.0–10.5; antenna: female 35; ovipositor: female 8.5–10.0 mm.