Bioacoustics of Paradecolya expectata

Description. Head and antennae: antenna more than twice as long as length of body (~ 4 cm long), scapus non armed. Cuticle of head smooth. Conical laterally compressed fastigium of vertex exceeding antennal sockets, reaching the middle of the antennal scapus (with forwardly stretched antennae). Space between eyes 1.8 times as wide as the wider diameter of eye (ratio 1.7–2.1). Eyes prominent, slightly projecting forward. Thorax. Pronotum with prosulcus distinct, meso- and metasulci indistinct, lateral lobe very shallow with a conspicuous ventral rim. Prosternal processes moderately long; mesosternal processes short and blunt, metasternum non armed. Thoracic auditory opening smaller than spiracle. Anterior margin shallowly concave, posterior margin almost strait. Legs: Fore coxae dorsally with anteriorly directed moderately long spine. Fore femora rounded dorsally, armed with 6 / 5 spurs; fore femora genicular lobe with one apical spine on each side. Fore tibia with one apical spur on both ventral sides; with 8 / 8 ventral subapical spurs; tympanal organ orifices ovoid, little expended, oriented forward on both sides, tympanic area not inflated. Mid trochanters with a ventral spine. Mid femora rounded, the ventral anterior side armed with 4 / 1 ventral spurs posterior ventral carina with numerous minute spinules; mid femora genicular lobe with one apical spine on each side. Mid tibia with one apical spur on both ventral sides; with 6–7 / 6 ventral subapical spurs; with a dorsal posterior preapical spur; with a single dorsal posterior sub-basal (proximal) spur. Hind femora rounded dorsally, with one ventral carinae armed with 7–11 spines; hind femora genicular lobes with one apical spine on each side. Hind tibia rectangular in cross section; 1 dorsal apical spur on both sides, and 2 ventral apical spurs on both sides; with 19–24 external dorsal spines, 15–23 internal dorsal spines, 6–10 external ventral spines, 5–9 internal ventral spines. Abdomen. Dorsal surface of tergites not modified. Male . Wings. FW longer than pronotum. Left FW stridulatory file 1.4 mm long, with 42–46 (average: 45) lamellar teeth ( Fig. 39 ); mirror D-shaped ( Fig. 34 ). Wings absent. Terminalia. Epiproct fused with last tergum, hind margin strongly convex. Paraprocts stout with a bilobate apex; moderately spatulate distally ( Fig. 25 ); each paraproct with a short external blunt process at the basis, 1.5 mm long (range 1.4–1.7). Cerci angled at the basis, flat, particularly broad, triangular in shape (in side view), the top angle of the triangle on the middle of the cercus ( Fig. 24 ); with a ventrally directed pointed process on the basis of outer margin; 2.6– 2.8 times as long as wide (maximal length, maximal width). Subgenital plate symmetrical with smooth surface, margin widely concave; 0.8 times as long as wide (maximal length, maximal width, range: 0.6–0.9). Styli blunt, 1.5 times as long as wide (range 1.2–2.0). Genitalia. Phallus with moderately long lateral phallomeres; dorsal phallomere bearing a sclerotized plate with denticles. Epiphallus cephalic lobe serrated, in side view distinctly inflated, forming a distinct angle with the neck ( Fig. 26 ). Female . FW reduced, slightly shorter than the pronotum; 3.6 mm long (range 3.1–4.0 mm). Wings absent. Terminalia. Ovipositor slightly excurved on the proximal third, curved upwards in apical third ( Fig. 44 ). Cerci slightly inwardly curved, with scattered hairs; 1.8 mm long (range 1.7–2.0). Subgenital plate long triangular with rounded apex ( Fig. 43 ); 1.1 times as long as wide (range 1.1–1.2). Color : Light green. FW with a black spot on the speculum. Rarely, specimens are light brown. Bioacoustics. Fig. 49–50 . The call of Paradecolya expectata n. sp. is close to P. inexpectata call. As this species, males are singing by night hours in the undergrowth from near the ground to several meters. Males do not moving while calling. I have not recorded the call of this species at temperature below 18°C. Above 18°C, the call consists of long echemes (> 1 min), made of many syllables; syllables are repeated at the rate of 9.5– 10.2 syllable/s (syllable duration: 45–59 ms; inter-syllable interval: 38–59 ms). Echemes are some times interrupted by short breaks (190–310 ms, Fig. 49 ) and seldom by triplets of syllables ( Fig. 50 ). Syllables are made of 12–21 trains of waves.