Bioacoustics of Euconocephalus narayanpurensis

Description. Male ( Figs. 1A, B, C ). Body large and slender. Head triangular in profile ( Fig. 2D ), rugose dorsally ( Fig. 2A ). Fastigium of vertex ( Fig. 2A ) conical, elongated with very weak median carinula; apex obtusely rounded; more than 1.5 times longer than its basal width; more than 2 times wider than first antennal segment. Fastigium separated from frons by a notch with a distinct ventral tubercle present at the base of fastigium ( Fig. 2D ); length of fastigium anterior to notch is 1.14 times longer than maximum length of an eye. Frons ( Fig. 2D ) slightly convex in profile, almost smooth. Eyes oval and prominent. Dorsum of pronotum ( Fig. 2A ) flat, rugose: anterior margin truncated with slight median concavity, posterior margin rounded; transverse sulcus distinct before the middle of pronotum; median carina weak, lateral carinae of pronotum absent. Lateral lobes of pronotum ( Fig. 2D ) longer than high, rugose; humeral sinus distinct. Prosternum ( Fig. 2B ) armed with a pair of spines, mesosternal and metasternal lobes triangular ( Figs. 1B , 2B ). Thoracic auditory spiracle large, oval, completely hidden under the lateral lobe of pronotum; a medium subapical tooth present on posterior edge of spiracle. Elytra ( Figs. 1A, 1C , 2F ) slightly longer than hind wings; costa parallel to radial, radial sector branched before the middle, apices narrowly rounded. Elytra and wings greatly surpassing the middle of hind tibiae when folded. Stridulatory file ( Fig. 2E , 3A, B ) on the ventral side of left tegmen with 70 teeth; file slightly curved, uniformly widened anteriorly; narrow at proximal end and wider at distal end. Legs: genicular lobes of all the femora unarmed on both sides; inner genicular lobes of mid and hind femora produced as a spine posteriorly. Fore coxae armed with a long spine. All femora dorsally unarmed. Fore femora ventrally armed with 2 minute spines anteriorly on inner margin and unarmed on outer margin. Mid femora ventrally unarmed on inner margin and 2 minute spines on outer margin anteriorly. Hind femora ventrally armed with 6-7 spines on both inner and outer margins. Fore and mid tibiae dorsally unarmed. Tympanum on fore tibia conchate on both sides, tympanal slits facing forward with a pair of small elongated pits laterally just below the tympanum. Fore tibiae ventrally armed with 6 small spines each on inner margin and outer margin. Mid tibiae ventrally armed with 7 small spines each on inner margin and outer margin. Hind tibiae dorsally armed with 17- 20 small sized spines on outer margin and 15-17 small sized spines on inner margin. Hind tibiae ventrally armed by 9-11 small spines on outer margin and 8-9 small spines on inner margin. Single dorsal pair of spurs and two ventral pairs (inner small and outer large) of spurs present on the apical region of hind tibiae. Posterior margin of male tenth abdominal tergite ( Fig. 2G ) produced into two triangular lobes with incurved apices, triangular excision present between them; median carina distinct, elevated in apical part. Supra-anal plate elongate-angular with dorsal longitudinal groove, apex rounded. Subgenital plate ( Fig. 2H ) long, lateral and middle ridges well developed, basal V shaped ridge distinct, apical margin with triangular excision; styli conical, long; apex obtuse. Cerci ( Fig. 2I ) thick with two incurved teeth, dorsal tooth short with long spine ventral tooth large with small spine. Female. Unknown. Colouration. Body brown. Antennae unicolour, yellowish brown. Lateral margin of fastigium of vertex on both sides with narrow yellow band which extends on the vertex above eye level and reaching up to the posterior margin of pronotum. Fastigium of vertex yellowish ventrally. Frons yellowish brown. Apex of clypeus and maxillary palpi dark brown. A yellow band arising from posterior margin of eye on both sides and extended on the lower margin of lateral pronotal lobes. Sternum yellowish brown with a longitudinal brown band interrupted in the middle. Tegmina with anterior external margin black, inside pale-bordered. Hind wing transparent. Forelegs of body colour. Ventral carinae of mid and hind femora dark brown. Measurements (mm).