Bioacoustics of Brachyamytta

Description. General. Body small, slender; brachypterous ( Figs. 7 A–F). Head. Fastigium of vertex triangular, blunt apically, barely reaching base of scapus, flat dorsally; scapus unarmed; antennae about twice as long as body; frons convex, vertical; eyes globular, moderately protruding. Terminal segments of labial and maxillary palps strongly distended apically, cone-shaped. Thorax. Pronotum surface smooth; lateral lobe wider than high; humeral sinus of pronotum absent; anterior margin of pronotum flat; metazona moderately elongate, flat to weakly convex; posterior edge of metazona broadly rounded. Prosternum unarmed. Legs. Legs extremely long and slender. Front tibia unarmed dorsally, with 3–4 spines on posterior and 4 on anterior ventral margin; ventral spines on front tibia as long as tibia diameter; tympanum bilaterally open, oval, about twice as long as wide; genicular lobes of front femur unarmed; front femur unarmed ventrally; front coxa armed with short spine. Mid tibia unarmed dorsally; thickened in proximal 3/4; with 2–3 spines on posterior and 3–4 on anterior ventral margin; mid femur unarmed ventrally; genicular lobes of mid femur unarmed. Hind femur unarmed ventrally; genicular lobes of hind femur unarmed ( Figs. 3 K, L). Wings. Tegmen reduced, reaching only 4th or 5th abdominal tergite; hind wings reduced to minute lobes, about 1/5 of tegmen length. Tegmen narrowed towards apex or broadly truncated; anterior margin straight to weakly convex. Costal field not dilated at base; veins Sc and R close together, parallel along their entire length or slightly diverging; right stridulatory area with large, fully developed mirror; left stridulatory area with large, fully developed, roughly rectangular mirror, stridulatory file weakly bent, with 87–100 teeth. Abdomen. Tenth tergite unmodified; epiproct unmodified, small and rounded. Cercus long and slender, slightly bent inwards or straight; apex unmodified or bent outwards under right angle; blunt or acute ( Figs. 3 A–F); paraprocts unmodified; sclerotized epiphallus absent. Subgenital plate trapezoidal; styli horizontal to vertical, pointing downwards; cylindrical, about twice as long as wide, parallel; separated by small gap or very close together, nearly touching. Female subgenital plate with two narrow lobes on posterior margin; posterior lobes acute to rounded, sometimes slightly divergent. Ovipositor. Apex with both valvulae smooth; dorsal edge of upper valvula parallel to lower valvula; ovipositor slightly curved; apex pointed; ovipositor shorter than hind femur ( Figs. 3 H, J). Egg. Egg elongate; tapered on one end; chorion densely reticulate (fig. 5G). Coloration. General coloration green to brown, with or without brown and yellow markings; antennal scapus without markings; antennae concolorous; eyes uniformly colored; face without darker markings; occiput without markings or with darker patches behind eyes; pronotum unmarked or with dark brown patches, posterior edge of metazona sometimes darker brown; tegmen with basal part lighter then remainder of wing, sometimes bright yellow; small, brown patch present behind stridulatory area; genicular lobes of front legs without markings; hind femur sometimes with darker markings; hind tibia green to brown; abdominal sterna without markings; subgenital plate without markings.