Bioacoustics of Pterodichopetala monternach

Diagnosis . Pterodichopetala monternach n. sp. , resembles P. cieloi at first sight ( Figs. 1 , 11 vs. 18, 27). It may be distinguished from the latter species because of its smaller size, male’s average 15.2 mm and females 17. 3 vs. 19.5 and 19.6 mm in P. cieloi males and females, respectively; shorter pronotum, average 2.8 mm in both males and females of P. monternach n. sp. , vs. 3.6 and 3.2 mm in males and females of P. cieloi , respectively; different shape of the stridulatory area (Fig. 4 vs . 20), stridulatory file ( Fig. 5 ) with ca 111 teeth, 7.6 mm in length and 14.6 teeth/mm (13–18) vs. P. c i el o i stridulatory file ( Fig. 21 ) with ca 70 teeth, 7 mm in length and 10 teeth/mm (8–12); the last abdominal tergite’s distal process ( Fig. 6a vs. Fig. 22a ) is less produced, more robust, strongly emarginated and distally rounded (not so in P. ci e l o i ); epiproct ( Fig. 6 b) sub-triangular, broad, bearing a sub-triangular depression at mid-portion, in P. cieloi is sub-rectangular wide u excised distally ( Fig. 22 b); cerci distinctive as shown in Figs. 6a , 7 , 8 vs. 22a, 23, 24; subgenital plate ( Fig. 8 vs. 24) basally narrow with broad distal angles (in P. cieloi it is sub-rectangular, with distal angles more acute rendering a wide u-shape); internal genitalia as shown in Figs. 9 , 10 vs. 25, 26. Females may be separated, in addition to its smaller size, by the more prominent dark brownblack markings on posterior portion of occiput and proximal area of tegmina ( Fig. 11 vs . 27), the different shape of the ovipositor’s lobe and basal sclerites (Figs. 14, 15 vs. 29, 30) and different subgenital plate (Fig. 16 vs . 31).

Description of males (alive). General color green ( Fig. 1 ). Fastigium of vertex moderately compressed, subconical; frontal fastigium (in dorsal view) sub-conical, surpassing considerable the fastigium of vertex; antennae’s scape greenish, pedicel and flagellum’s half basal portion reddish-brown, distal portion of flagellum dark-brown, some white-black segments along flagellum, eyes rounded and prominent, occiput posteriorly dark-brown blackish; postocular band whitish-creme extending onto sides of pronotum. Pronotal disc ( Fig. 3 ) sub-pentagonal (in dorsal view), anterior and posterior margins reddish-brown, both margins slightly emarginated, carina media whitish-creme, conspicous; typical sulcus on pronotal disc shallow wide u shape, cutting the lateral carinae and extending to middle of lateral lobes in form of a groove; lateral lobes of pronotum ( Fig. 2 ) sub-rectangular (lateral view), humeral sinus absent. Stridulatory apparatus ( Figs. 1 , 4) with dark-brown black edge; stridulatory file ( Fig. 5 ) with ca 111 teeth, 7.6 mm in length, 14–15 teeth/mm (13–18). Tegmina’s proximal portion black (Fig. 4), surpassing the terminal tergite, with prominent venation, lower margins whitish-creme with dark brown spots above; hind wings vestigial. Terminal tergite projected distally into a broad structure, with edge dark brown folded strongly inwards. Cerci ( Figs. 6a , 7 , 8 ) complex, made up of three processes: the proximal portion of the main shaft is slightly broader, then tapers gradually and bends inwards towards the rounded apex; beyond mid length of main shaft a short, stout, curved inwards, spike-like projection originates; the main shaft’s elongated arm (ventral view) splits proximal to the apex and gives rise to two process, the ventral process tapers gradually towards a spiky apex and it is embedded within the flabellate apex of the dorsal process. The subgenital plate ( Fig. 8 ) is moderately produced, sub-triangular, v excised distally, angles broadly acute. Internal genitalia as shown if Figs. 9 and 10. Measurements (mm) males. Body length from vertex to end of abdomen: 15.2 ± 1.1 (14.0–16.5). Pronotum length: 2.8 ± 0.26 (2.4–3.0). Tegmen length: 10.0 ± 0.6 (9.1–10.8). Fore femur length: 4.0 ± 0.3 (3.7–4.4). Mid femur length: 4.7 ± 0.26 (4.4–5.0). Hind femur length: 10.6 ± 0.9 (9.3–11.5). Description of females (alive). Similar to the males ( Figs. 11 , 12 ), almost completely green; occiput dark brown-black posteriorly; tegmina surpassing the terminal tergite, proximal portion black, upper and lower margins whitish-creme with feeble brown spots above. Ovipositor (Fig.14) longer than head and pronotum together, evenly curved upward, lower margin almost straight on basal 3/4, distal fourth lower and distal half upper margins spinulated; basal lobe of ovipositor sub-circular with undulated margin ( Fig. 15 ). Subgenital plate (Fig. 16) subelliptical, projected distally and divided by a median suture; basal sclerites large, sub-triangular. Measurements (mm) females. Body length from vertex to end of abdomen: 17.3 ± 0.35 (16.9–17.6). Pronotum length: 2.8 ± 0.0. Tegmina length: 11.7 ± 0.25 (11.4–11.9). Cephalic femur length: 4.5 ±0.15 (4.4–4.7). Mid femur length: 5.4 ± 0.26 (5.1–5.6)). Caudal femur length: 11.7 ± 0.4 (11.2–11.9). Ovipositor: 8.8 ± 0.7 (8.0– 9.4).