Bioacoustics of Anthracites alatus

Description. Habitus of male as shown in Figs 1A , 2A . Head. Fastigium verticis compressed laterally, in dorsal view conical with faint fine longitudinal groove ( Fig. 3A ); apex truncated, shorter than scapus ( Fig. 3B ). Lateral ocelli anterior to median one. Frons shining with few shallowly impressed dots ( Fig. 3C ). Thorax. Pronotum smooth, disc broadly rounded into paranota, apical area rounded and faintly shouldered; anterior transverse sulcus short and broadly rounded, posterior transverse sulcus longer and angularly rounded; anterior margin truncated and straight; posterior margin subtruncated ( Fig. 3A ). Paranota with ventral margin concave, posterior margin obliquely rising posteriorly and slightly concave ( Fig. 3B ). Acoustic spiracle large and oval, completely covered by paranota. Prosternum with two long acute spines pointing nearly ventrad. Mesosternal and metasternal lobes conical with acute apices. Internal and external tympanum on anterior tibia slightly swollen with narrow slit. Legs. Anterior coxa with spine long and slightly curved. Femora with the following number of spines on ventral margins: anterior femur 6–8 external, 5–6 internal; middle femur 6–7 external, 3 internal; posterior femur 8–9 external, 1–2 internal. Knee lobes of anterior and middle femora obtuse or subacute externally and spinose internally; knee of posterior femur bispinose on both sides, longer than those of anterior and middle femora. Tegmina and wings. Tegmen micropterous, mirror area fully covered by pronotal disc ( Fig. 3A ), reaching apex of third abdominal tergite, with apex subtruncated; hind wing present, but covered by tegmen. Abdomen. Tenth abdominal tergite transverse, distinctly broader than long, at posterior margin truncated with two very short lateral lobules; posterior margin of lateral lobules raised and having fine setae ( Fig. 3D ). Epiproct broadly tongue shaped, basal half having longitudinal groove at middle ( Fig. 3E ). Cercus short and stout, F-shaped, compressed, distal end roundly truncated ( Fig. 3D ); at apex with two inner processes pointing inwards (perpendicular to length of cercus) ( Fig. 3D ); dorso-distal process conical, larger with apex having small sclerotized tooth, ventroproximal process parallel to and slightly shorter than dorso-distal process, cylindrical, slenderer, with apex obtuse ( Figs 3D–G ). Subgenital plate about as long as wide; with anterior margin concave; apical end angularly emarginated, posterior margin at middle truncated with dense long setae ( Figs 3F, 3G ); margin around bases of styli on dorsal side swollen and with triangular internal tooth of subacute sclerotized apex ( Fig. 3E ). Styli stout with apex rounded ( Fig. 3F ). Titillators ( Fig. 4 ) separate, strongly sclerotized, wing-like; lateral arm plate-like, internal-half very broad, external-third stoutly tongue shaped; apical end broadly rounded, pointing dorso-distally, along margin slightly folded; base with proximal end clog-shaped; provided with two pairs of lateral sclerites weakly sclerotized. Female. Unknown. Colouration. Body generally pale yellow when preserved ( Figs 1A , 2A ), green when alive. Face with pair of black bands from inner margin of antennal scapus to outer base of mandibles, widening ventrad ( Fig. 3C ). Median ocellus cream coloured. Scapus with basal-half and dorso-inner side black, otherwise pale yellow; antennae yellow ( Figs 3A–C ). Maxillary palpi with segments pale; mandible black, clypeus with pair of black bands continuing from frons ( Fig. 3B ). Pronotum pale yellow, anterior margin with two lateral bands, near posterior margin with two large black patches having well-defined margins shaping like triangles ( Figs 3A, 3B ). Tegmen with lateral field at base bright yellow, otherwise veins pale yellow and cells generally black ( Fig. 3B ); dorsal field mostly pale yellow, some cells dark brown ( Fig. 3A ). Anterior and middle femora unicolourous pale yellow; fore and middle tibiae similar, but fore tibia having distal part of tympanum with small black dorsum spot and distally slightly darker ( Fig. 3B ). Posterior femur pale yellow, knees slightly darker. Posterior tibia pale yellow with spines brown. Tarsus cream coloured with distal margin black. Abdominal tergite pale yellow, with posterior margin having lateral bands that become narrower towards apical segments ( Fig. 3D ). Male tenth abdominal tergite, epiproct and cercus generally orange yellow ( Fig. 3D ). Sternites and subgenital plate yellow ( Fig. 3F ). Measurements. See Table 1 .