Bioacoustics of Axylus mabinii

Description. Habitus of male as shown in Fig. 6A . Fastigium verticis compressed laterally ( Fig. 7A ), in dorsal view conical, shorter than scapus, apex obtuse, with ocelli at base ( Fig. 7B ); ventral area compressed and ventral margin separated by a weak sinuosity from fastigium frontis ( Fig. 7A ). Vertex with a pair of irregular sulci ( Fig. 7B ). Frons shining with few shallowly impressed dots and wrinkles especially towards clypeus. Pronotum subsmooth, disc rounded into paranota, apical area subflat and shouldered; two transverse sulci not interrupted in middle; anterior margin faintly emarginated in middle; posterior margin rounded ( Fig. 7B ). Paranota strongly descending posteriorly (typical of genus), with anterior angle rounded; ventral margin concave and considerable descending posteriorly; posterior angle angularly rounded; auditory swelling long-ovoid; humeral sinus weak ( Fig. 7C ). Macropterous, tegmen surpassing abdominal apex and slightly longer than hind wing, apex rounded. Prosternum with two long acute spines. Mesosternal lobes long-conical, apex subacute; metasternal lobes short conical, apex obtuse; medial plate with an obtuse tubercle. Anterior coxa with a long and curved spine ( Fig. 7C ). Internal and external tympana on anterior tibia conchate with narrow openings. Femora with the following number of spines on ventral margins: anterior femur 7 external, 7 internal; middle femur 6 external, 3 small internal at the base; posterior femur 10–13 external, 7 internal (2 distal spinose and 5 basal minute nodular). Knee lobes of anterior and middle femora obtuse externally and short spinose internally; of posterior femur bispinose on both sides. Tibiae with the following number of spines on ventral margins: anterior tibia 7 external, 7–8 internal; middle tibia 9 external, 8 internal. Male. Stridulatory file on underside of left tegmen slightly sinuous; about 1.55 mm long; with teeth increasingly wider and more widely spaced towards middle compared to basal end; with about 64 teeth ( Fig. 7D ). Tenth abdominal tergite at posterior margin truncated, faintly and broadly emarginated in middle, forming faint lateral lobes ( Figs. 7E, 7F ). Epiproct broadly tongue-shaped, concealed by tenth abdominal tergite ( Fig. 7F ). Cerci very stout and conical ( Fig. 7G ), laterally compressed; apex obtuse; with a broad baso-internal process pointing anteriorly and internally; ventral of this process with a slender process pointing internally; both processes with apex sclerotised and acute ( Figs. 7E, 7F, 7H ). Subgenital plate barely surpassing cerci, with rounded lateral carinae and a narrow but distinct median carina; apex widely excised; styli short with apex obtuse. Titillators large, elongate, separate; basally with rounded apex; converging in middle and nearly parallel to one another before diverging apically; slender posteriorly and produced into an acute apex, curved dorsad just before apex ( Fig. 7I –K ). Dorsal sclerites slender and curved, with posterior margin undulated ( Fig. 7I ). Lateral sclerites semi-membranous, with a rounded nodular sclerite ( Fig. 7K ). Female ( Fig. 6B ). Tenth abdominal tergite excised in midline, apical margin on each side truncate. Epiproct broadly rounded. Cerci with apex pointing. Subgenital plate small, broad, triangular, with apex rounded. Ovipositor compressed, elongo-falcate but basal area substraight; dorsal margin substraight in middle, only slightly curved apically; ventral margin curved after basal area; widest slightly after middle, margins smooth ( Fig. 7L ). Colouration. Yellow brown. Face black, fastigium verticis yellow brown, median ocellus yellow, genae yellow brown; scapus and antennae yellow brown; maxillary palpi yellow brown, clypeus and labrum orange, mandible black ( Fig. 7A ). Pronotum yellow brown, with two black spots at anterior angles of disc and two larger black lateral bands in posterior area of disc; all black spots slightly continue onto paranota ( Figs. 7B, 7C ). Tegmen yellow brown ( Fig. 6 ). Legs mostly yellow brown ( Fig. 6 ). Abdominal tergites and sternites yellow brown. Ovipositor ventro-basally yellow, otherwise red brown ( Fig. 7L ). Measurements ( 1 male holotype , 1 female paratype ). BL: male 34.5, female 34.6; BWL: male 54.9, female 56.3; PL: male 11.7, female 11.0; PW: male 7.5, female 8.8; TL: male 42.8, female 44.8; HFL: male 28.0, female 28.8; HTL: male 27.1, female 28.2; OL: female 21.1 mm .