Bioacoustics of Alexanderellus kumangui

Description. General coloration grayish brown, eyes purple, sternites, inner face of fore and middle femora yellowish brown, outer face of femora dark brown, base of hind femur whitish green, male cerci yellow with black apex and lower border. Head. Fastigium of the vertex erect, moderately raised, apex rounded; ocelli round, the lateral ones being more conspicuous than the frontal one ( Fig. 24F ). Thorax. Pronotal disc with a sub-elevated midline on the metazona; lateral lobes near the posterior border moderately inflated, where the pronotum covers the auditory spiracle; humeral sinus rounded ( Fig. 24C ). Meso- and metasternal lobes rounded, close together, metafurcal groove triangular and moderately wide. Wings. Tegmina projecting well beyond abdomen, anal border dilating toward the apex, stridulatory crest straight and almost as long as the posterior edge of the pronotal disc ( Fig. 24B ). Legs slender and armed with triangular, lamellar spines: fore femora with three and middle femora with two ventral spines, fore and middle tibiae with small ventral spinules and the middle tibia with dorsal ones; hind femur with four medium-sized ventral spines and a conspicuous foliose spine with four sharp undulations on outer margin; hind tibia with 14 dorsal spines on outer margin and 12 ones on inner margin. Abdomen. Tenth tergite without modification; epiproct ovoid, a little longer than wide. Outer branch of the cerci longer than the internal one, thin and with a small pre-apical hook on the ventral margin, apex pointed ( Fig. 24G ); internal branch sub-triangular with the apex curving backward ( Figs. 24H, I ). Distal half of subgenital plate moderately narrow, posterior emargination broadly U-shaped with straight middle part, styli longer than depth of the emargination, slender, with conical apex. Female. Unknown. Measurements (in mm.). LT: 29.5, Pr: 3.5, Teg: 25, HF: 12, HT: 10.5. Comparison. The new species differs from A. mariposa n. comb. by its smaller size. A. mariposa has a total length of 36 cm (including the wings), the male of that species has thinner and more delicate cerci, the emargination of its subgenital plate is V-shaped and not very deep (U-shaped in the new species), and the tips of the styli are slightly tapering (conical in the new species).