Bioacoustics of Philmontis pandus

Description. Small species with wings not fully covering abdomen, in male leaving the last two or three segments free ( Fig.1K ), in female covering about half of abdomen, in one female nearly reaching end of abdomen ( Figs 6K–L ). Pronotum elongate, disc with anterior margin faintly concave, posterior margin broadly rounded. Prosternal spines minute or absent; mesosternal lobes obtuse; metasternal lobes rounded. Femora with the following number of spines on ventral margins: (1) 3-5 / 1-4; (2) 4-6 / 0-2; (3) 5-8 / 0 (n = 9); hind knee lobes with one spine. Male. Stridulatory file ( Fig. 4L ): total length 1.06, 1.12 mm ; area with countable teeth 0.94, 1.04 mm with 52, 63 countable teeth; from base to end of distinct area 0.84, 0.82 mm with 41, 42 teeth; area with distinctly spaced, including largest teeth 0.75, 0.70 mm with 39, 33 teeth (n = 2; specimens from Edie Creek, Wau). Cerci with external surface convex, internal surface with concave furrow widening from more basal to apical area; at end cercus narrowed and markedly curved mediad, terminating into a small acute tooth; just before curvature with a small, compressed and curved internal process from dorsal margin with longer convex distal and shorter concave proximal margin, at end with two acute teeth distinctly separated from each other ( Fig. 3H–I ). Subgenital plate roundly excised from base, ventral disc with little converging margins that are curved dorsad and then laterad forming compressed lateral expansions with little wavy margin; central disc in apical area with lateral margins extended into long, rounded projections that are widened at end and carry minute styli at oblique tip. Titillators long and narrow, basal area hyaline, sub-fused and expanded apico-laterad; afterward narrow parallel-sided, in about mid-length widened, forming a transverse triangular area with curved apical arms that are at end provided with a sclerotized disc twisted against titillator axis; surface of titillators largely hyaline, in apical half darker than in basal half; surface of triangular, widened area light brown with scattered small brownish spots ( Fig. 5N ). Female. Subgenital plate with anterior margin faintly convex in middle; with a narrow membranous fissure along midline of disc widening apically; anterior area extended on both sides into a large, rounded expansion with concave surface that is subdivided by a lateral extension of the bulging anterior margin of the disc; disc behind lateral extensions with converging lateral margins that are at end of plate extended into narrow conical extensions with approaching margins and subacute tip ( Figs 8J–K ). Ovipositor stout at base; curved with regularly approaching margins toward acute tip. Wing length varying from covering basal half to almost fully covering abdomen ( Figs 6K–L ). Measurements ( 4 males , 12 females ).—Body w/o wings: male 17.5–20.0, female 15–21; pronotum: male 5.2–7.5, female 5.5–7.2; tegmen: male 8.5–10.0, female 5.7–12.0; hind femur: male 9.7–11.0, female 10.0–11.5; antenna: male 40, female 50–55; ovipositor: female 9–10 mm .