Bioacoustics of Peracca (Peracca) macritchiensis

Description. Habitus of male as shown in Fig. 7 A. Fastigium verticis barely surpassing apex of scapus; dorsally with apex acute. Frons shining with impressed dots. Pronotum subrugose, disc broadly rounded into paranota. Tegmen in male micropterous, reduced to stridulatory apparatus, not covered by pronotum ( Fig. 7 B); female squamipterous ( Fig. 7 C). Prosternal spines present. Femora with the following number of spines on ventral margins: profemur 3-4 large and 3-4 small external, 4 large and 6-8 small internal; mesofemur 1 basal, 4 large, 4-7 small external, 1 basal, 0-1 small internal; postfemur 11-13 external, 15 internal (n = 1, holotype ). Knee lobes of pro- and mesofemur obtuse externally and spinose internally; of postfemur spinose on both sides, longer than those of pro- and mesofemur (particularly the external). Male. Tenth abdominal tergite broadly rounded apically, very weakly bilobate in middle ( Fig. 7 D). Cerci bulbous basally; with a large, slightly compressed, baso-internal process, bent anteriorly near middle of process, apex acute; remainder of cercus slightly compressed, long and narrow, gently sinuate; dorsal margin in apical area with minute denticles, very apex split into two rounded lobes, and provided with a long, narrow, curved, acute apical spine ( Fig. 7 E). Subgenital plate with apical margin subtruncate, slightly concave in middle ( Fig. 7 F). BL BWL PL PW TL HFL HTL OL Male holotype 33.0 - 8.9 6.0 1.9 17.7 18.6 - Male paratype (14 Mar.2010) 24.7* - 8.2 6.0 2.0 17.0 17.5 - Male paratype (14 Mar.2010) 29.1* - 8.8 6.5 1.8 19.4 20.0 - Male paratype (18 Mar.2010) 26.9* - 8.4 6.3 1.9 17.7 18.6 - Male paratype (15 Nov.2010) 30.9 - 8.6 6.2 2.2 18.3 19.7 - Males (n = 5) - - 8.2–8.9 (8.6) 6.0–6.5 (6.2) 1.8–2.2 (2.0) 17.0–19.4 17.5–20.0 - (18.0) (18.9) Female paratype (23 May.2009) 36.1 - 8.6 6.6 1.7 20.5 21.2 15.9 Female paratype (14 Mar.2010) 29.3 - 8.0 6.6 1.0 18.8 20.1 15.3 Female paratype (18 Mar.2010) ?** - 7.4 6.3 1.6 17.6 19.0 15.5 Female paratype (10 Apr.2010) 29.3* - 8.3 6.5 1.3 20.0 21.2 16.6 Female paratype (10 27.6* - Apr.2010) 8.4 6.4 1.3 19.6 21.0 16.6 Female paratype 31.0 - (7 Sep.2005) 7.2 - 1.2 17.5 18.5 15.0 Female paratype 26.5* - (19 Dec.2009) 7.8 6.2 1.5 19.3 20.9 14.8 Females (n = 7) - - 7.2–8.6 - 1.0–1.7 17.5–20.5 18.5–21.2 14.8–16.6 (8.0) (1.4) (19.0) (20.3) (15.7) * abdomen shrunk during dry-preservation. ** body dismembered. Female. Tenth abdominal tergite with apex deeply and broadly triangularly incised. Cerci with apex pointing. Subgenital plate wider than long, furrowed in middle; apex bilobate and apical margin upcurved ( Figs. 7 G, 7H). Ovipositor dagger shaped; with substraight basal and gently curved apical area; apical area with dorsal margin straight, ventral margin gently curved; margins smooth ( Fig. 7 I). Colouration. Generally brown to testaceous. Frons, mandibles, labrum, dorsal part of clypeus, genae black; ventral part of clypeus and palpi white; palpi pale yellow with some tint of green; labrum, scapus, pedicellus, vertex and occiput yellow brown; vertex and occiput with some red venation. Pronotum red brown, sometimes with some tint of black and white; in some specimens, disc white (on the outside) and black (on the inside) longitudinal stripe on each lateral side; white spot on anterior and posterior part of that strip; ventral margin of paranota white. Abdomen testaceous to brown with light dots; tergites with faint red brown longitudinal medial strip, with black spot at the posterior margin of each tergite; pleurite with dark red brown marmoration; sternites pale. Legs generally yellow brown, spines white with black apices. Protibia, and to a smaller extend mesotibia, with black spots dorsally, sometimes faint. Postfemur brown with black stripes on interior and exterior surfaces; with apical half black ventrally. Posttibia brown dorsally and black ventrally Measurements ( 5 males , 7 females ). See Table 4 .

Distribution. PENINSULAR MALAYSIA ( Johor State : PFR [new]); SINGAPORE Calling song (1♁, 30.5°C) ( Fig. 8 ). The calling song of the male recorded from PFR is not different from that recorded from Singapore (see Tan et al ., 2023 ). The calling song consists of a continuous trill. The syllable duration is 7.2±0.3 ms (6.8–7.6 ms) (somewhat shorter than that reported in Tan et al ., 2023 ) and the interval between consecutive syllables is 5.3±0.3 ms (5.0–5.7 ms). The syllable repetition rate is 80±1 syllables s−1 (79–83 syllables s−1 ), which is very similar to the rate reported in Tan et al . (2023) . The call spectrum is broad-based and has a peak frequency of 30.5±0.9 kHz (29.3–31.2 kHz), which is also similar to that reported in Tan et al . (2023) .