Bioacoustics of Philmontoides affinis

Description. Pronotum elongate, disc with anterior margin faintly convex or little concave in middle, posterior margin broadly rounded, the latter covering only base of stridulatory area of tegmen, transverse furrows interrupted in middle; lateral lobes not very deep, ventral margin slightly concave, at end forming a rounded angle with posterior margin projecting laterad and clearly visible from above. Prosternal spines long; mesosternal lobes obtuse; metasternal lobes rounded with an angle or fold; Femora with the following number of spines on ventral margins: (1) 5-7 / 5-8; (2) 6-7 / 1-3; (3) 8-12 / 7-12 (n = 7); hind knee lobes bispinose. Male. Stridulatory file ( Fig. 12E ): total length 1.53–1.58 mm ; area with countable teeth 1.42–1.43 mm with 53–57 teeth; area with largest teeth 0.76–0.79 mm with 22–23 teeth (n = 2). Tenth abdominal tergite vaulted, hind margin broadly rounded, at end narrow, angularly excised and extended into a pair of short and narrow projections ( Fig. 11F ). Cerci compressed with convex external and concave internal surface, in about little more than apical half with a large rounded ventral expansion; dorsal margin with a long, rounded and curved projection in subbasal area with small acute spine at tip, also end of dorsal margin of cercus prolonged into a large acute spine ( Fig. 11F ). Subgenital plate nearly parallel-sided, hind margin concave, at both angles with a stylus at apico-ventral side. Titillators in basal area whitish hyaline, simple, forming narrow, semi-transparent bands with curved base, afterward widening and covered with scattered granules, along lateral margins bordered by a bunch of dense long hairs; apical area with dark, sub-hyaline rim and very fine granular surface; in apical area titillators curved again, of light color and covered by short hairs; apical margin forming a curved, sclerotized crest, little projecting on both sides ( Figs 15A–C ). Female. Subgenital plate in central area forming a pair of auriculate expansions with stiffened rim and depressed surface, these structures are prolonged from dorso-lateral angles into stout cones with a few transverse riffles along ventral surface; area between expansions membranous; apical area of plate in ventral view parallel-sided with a medial furrow; at end divided into two short and stout, rounded lobes; in lateral view area behind basal expansion forming a short, parallel-sided and high plate with slightly convex apical margin ( Figs 17K–L ). Ovipositor as genus. Coloration. Face of general color, fastigium verticis, antennal scrobae and internal side of scapus of antennae dark brown to black; lateral areas of occiput and dorsal areas of genae also black; anterior tibiae above and below tympana with black spots; pronotum with indistinct narrow, interrupted, black stripe along midline; lateral lobes mostly blackish but auditory swellings pale; tegmen with black lateral band, otherwise mostly with dark cells and light veins and veinlets; hind femur with black ring in sub-apical area. Measurements ( 7 males , 1 female ).—Body w/wings: male 33–36, female 36; body w/o wings: male 26–32, female 30; pronotum: male 6.2–8.5, female 7.2; tegmen: male 22–26, female 26.5; hind femur: male 20.0–22.5, female 22; antenna: male 80–100; ovipositor: female 25 mm .