Bioacoustics of Varitrella (Cantotrella) suikei

Description. Habitus very typical of the genus, medium sized ( Fig. 15 ). Head with dorsum slightly flattened, very finely pubescent; rostrum 1.1 times as wide as scapus, with apex truncated (in dorsal view) ( Fig. 16A ); scapus large and elongated; maxillary palpi with apical segment longest, cylindrical and oblong with obtuse apex, with subapical segment shorter than third segment ( Fig. 16B ); eyes projected anteriorly in dorsal view ( Fig. 16A ); median ocellus round and small; lateral ocelli oblong and large, located near eyes. Pronotal disc 1.4 times as wide as long, faintly widening posteriorly (posterior margin 1.2 times as wide as anterior margin); finely and densely pubescent; anterior margin of disc distinctly concave in middle; posterior margin of disc nearly straight to slightly convex ( Fig. 16A ). Pronotal lateral lobe 1.4 times as long as high, with ventral margin straight ( Fig. 16B ). Metanotal gland absent ( Fig. 16C ). Fore tibia slightly swollen, with inner tympanum slit-like, with outer tympanum open and having elongate, oval tympanal membrane; hind tibiae with 7 inner and 5 outer long spines in distal half, 2–6 denticles spines, with small denticles before most proximal spines, and with inner spurs (apical spines) longer than corresponding outer ones. Tegmen ( Fig. 16D ) covering abdomen and surpassing apex of hind femur; with mirror 1.5 times as long as wide, dividing vein typical of subgenus; with 5 veins in harp area; with around 16 branches on Sc ( Fig. 16D ); hind wings clearly surpassing tegmina. Anal plate broad, with two whitish oval parts at base, slightly indented at apex ( Fig. 16E ). Subgenital plate typical of subgenus. Male genitalia as shown in Fig. 17 : Epiphallus in dorsal view with dorso-anterior epiphallic spine (ds) strongly sclerotised, somewhat laterally pointed, lateral margin concave, posterior end produced into two latero-apical lobular parts (al), deeply V-emarginated between latero-apical lobules; in profile with posterior part rounded with a dorsoapical spinule and two smaller spinules on dorsal margin, dorsal margin straight. Ectoparameres (ec) hooked-like, curved tapering into an acute apex, and pointing ventrad posteriorly. Rachis (ra, guiding rod) rather long, but not surpassing epiphallus, produced into two lateral lobes (lo) at posterior end, with apical emargination wider between lateral lobes in dorsal view; lateral lobe (lo) strongly widened and roundly rectangular in profile. Endoparameral apodemes (ae) very long, narrowing and converging towards each other anteriorly. Female. Unknown. Colouration. Body generally grey-brown ( Fig. 15 ). Head and pronotum with few dark spots (more in pronotal lateral lobe), but not as plentiful as some congeners ( Figs. 16A, 16B ); scapus and pedicel slightly lighter in colouration; maxillary palps with apical segment dark distally. Tegminal dorsal field yellowish, with some darker infumation but not obvious, veins range from yellow to dark; with a dark patch where the stridulatory file, diagonal and chords converge and a dark strip between mirror and CuA ( Fig. 16D ). Lateral tegminal field paler, almost transparent with darker brown veins, with small black spots near Sc between branches of Sc ( Fig. 16E ). Hind wings trans- parent. Legs generally pale brown with irregular and sparse dark spots. Thoracic and abdominal segments yellow brown to brown; anal plate brown with two whitish oval parts at base and another whitish spot before apex. Measurements (in mm). Male holotype BL = 16.9; HL = 2.8; PL = 2.7; PW = 4.0; TL = 18.7; TW = 4.0; HFL = 14.0; HTL = 13.1.