Bioacoustics of Philmontis robustus

Description. Small, brachypterous species with tegmen covering about half of abdomen. Face of uniform color, antennal scrobae black. Pronotum elongate, disc with anterior margin faintly concave, posterior margin broadly rounded. Prosternal spines absent; mesosternal lobes obtuse; metasternal lobes rounded. Femora with the following number of spines on ventral margins: (1) 4-5 / 1-3; (2) 4 / 0-1; (3) 5 / 0; hind knee lobes unispinose (n = 1). Male. Stridulatory file with about 35 teeth at 0.75 mm that are distinct and clearly spaced in basal and central areas, becoming denser and smaller toward apical area; at end with a number of very tiny, uncountable pegs; total file length including uncountable pegs at both ends 0.99 mm ( Fig. 4I ). Tenth abdominal tergite little longer than preceding tergite, with hind margin rounded but in middle with a rounded excision of about one third the length of the tergite ( Fig. 3J ). Cerci in about basal two thirds stout and cylindrical, in apical third narrow with convex external and concave internal surface, curved mediad and terminating into a small acute tooth; at transient zone with a stout, dorso-ventrally compressed internal process that carries along apical margin four minute acute teeth, the last tooth at tip ( Fig. 3K ). Subgenital plate in more than basal half with upcurved and roundly extended lateral areas; ventral disc in middle excavated and with fine medial ridge, lateral margins roundly swollen and later extended into projections that carry at tip narrow styli; hind margin deep roundly excised. Titillators curved at base, afterward triangularly widening with subtruncate apical margin that is extended at distal angle into a compressed, sclerotized disc ( Fig. 5M ). Coloration. Of rather uniform pale color (discolored); tegmen with blackish cells and light veins. Measurements ( 1 male ).—Body w/o wings: 18; pronotum: 7.2; tegmen: 7; hind femur: 11 mm .