Apterolarnaca (Bianigryllacris) spiculoproceris sp. nov.

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Figures 3, 4C–D

Diagnosis. The female subgenital plate transverse, with posterior margin truncate (Fig. 3J), the apico-lateral angles spine-shaped (Fig. 4C–D).

Description. Female. Body small. Fastigium verticis wider than scape. Face with very fine transverse “riffles” and sparse punctures; fastigium frontis separated from fastigium verticis by a very fine suture (Fig. 3A). Ocelli indistinct.

Pronotum with anterior margin arched, posterior margin nearly straight (Fig. 3B); lateral lobes longer than high, anterior angle rounded, posterior angle slightly extending downwards (Fig. 3C).

Fore coxae with 1 spine. Fore and middle femora unarmed on ventral surfaces, middle femora with 1 apicointernal spine, hind femora with 11–14 internal and 4 external spines on ventral surface. Fore and middle tibiae with 5 pairs of ventral spurs, including 1 pair of apical ones; hind tibiae with 5–6 internal and 6 external spines on dorsal surface, apices with 1 pair of dorsal spurs and 2 pairs of ventral spurs.

Second and third abdominal tergites each with two rows of stridulatory pegs (Fig. 3E). Subgenital plate inverted trapezoidal in ventral view (Fig. 3J), wider than long, the apico-lateral angles spine-shaped and curved dorsad (Fig. 3G–H). Ovipositor short and strongly curved upwards, with dorsal and ventral margins smooth, its apices obtuse (Fig. 3H); with a pair of ovoid, lateral sclerites at base of ventral valvulae, which projecting outwards (Fig. 3J).

Male. Unknown.

Coloration. Body yellowish brown. Ventral margins of antennal cavities blackish, face with 1 pair of blackish spots at fronto-clypeal suture. Eyes blackish brown. Doral surface of head with one large black spot behind antenna on each side, between area of antennae with irregular black spot along the midline (Fig. 3B). Margins of pronotum blackish (Fig. 3C). Apical areas of femora blackish, basal and apical areas of tibiae of all legs blackish; dorsal spines of hind tibiae black (Fig. 3D). Dorsal surface of abdominal tergites with longitudinal blackish band along the midline.

Material examined. Holotype: female, Wutaishan, Leye, Guangxi, August 29, 2021, coll. by Xiangyi Lu.

Measurements (mm). Female (Holotype): BL 21.6, PL 3.7, HFL 9.5, OvL 6.3.

Distribution. Guangxi (Leye).

Etymology. The new species name refers to the female subgenital plate with a spinous process at each apicolateral angle of posterior margin.

Discussion. The new species is similar to Apterolarnaca (Bianigryllacris) xinganensis Lu, Zhang & Bian, 2022 and Apterolarnaca (Apterolarnaca) truncatoloba (Li & Liu, 2015) in coloration, but differs from them by: posterior margin of female subgenital plate almost straight (Fig. 3J), the apico-lateral angles spinous projected (Fig. 4C–D). While Apterolarnaca (Bianigryllacris) xinganensis Lu, Zhang & Bian, 2022, posterior margin of female subgenital plate widely arched with middle area slightly projected (Lu et al., 2022: Fig. 11E). The female subgenital plate of Apterolarnaca (Apterolarnaca) truncatoloba (Li & Liu, 2015) has rounded apico-lateral angles on posterior margin (Fig. 4B).