Apterolarnaca (Bianigryllacris) tenuispinacia sp. nov.

DZIJXBdzfiȃ

Figures 6–8

Description. Male. Body slightly smaller than other species. Face nearly smooth, with scattered impressed dots and shallow transverse riffles (Fig. 6A). Fastigium verticis wider than scape. Ocelli indistinct (Fig. 6A).

Anterior margin of pronotum slightly projected in the middle, posterior margin finely concave (Fig. 6C–D); lateral lobes loner than high, anterior angle rounded (Fig. 6B).

Fore coxae swollen, with 1 spine (Fig. 6B). Fore and middle femora unarmed on ventral surfaces, hind femora with 6–9 internal and 1–3 external spines on ventral surface. Fore and middle tibiae with 5 pairs of ventral spurs, including 1 pair of apical ones; hind tibiae slightly curved (Fig. 6E) with 4–5 internal and 5–6 external spines on dorsal surface, apices with 1 pair of dorsal and 2 pairs of ventral spurs.

Second and third abdominal tergite with two rows of stridulatory pegs respectively (Fig. 6E). Eighth abdominal tergite prolonged, curved downwards (Fig. 6F). Ninth abdominal tergite split along the midline, terminating into a slender spine on both sides, its apex directing forward and slightly inward (Fig. 6H). Cerci conical and stout. Subgenital plate with V-shaped concavity on posterior margin, the lateral lobes terminating into a digitate process (Fig. 6I). Styli absent.

Female. Subgenital plate nearly inverted trapezoidal in ventral view, the lateral margins of basal area triangular and curved dorsad, narrowing to apex, posterior margin almost straight with indistinct median concavity (Fig. 7G). Ovipositor short and strongly curved upwards, dorsal and ventral margins smooth, apices obtuse (Fig. 7E).

Coloration. Body yellowish brown, Face with 1 vertical stripe along the midline (Figs. 6A, 7A), which reaching dorsal surface of head and then extending to the apex of abdomen, the median band widened to semicircular at posterior margin of head (Fig. 6C) and varying extension at the disc of pronotum (Fig. 6C). Genae below eyes with 1 black vertical stripe on each side (Fig. 6A). Clypeo-frontal suture with 1 pair of black spots (Fig. 6A). Fastigium verticis with 1 black horizontal stripe, behind the stripe with 1 black spot on external side of the median black band (Fig. 6A). Eyes black. Internal margin of antennal cavities and scape with black spots. Flagellum black. Maxillary palpi light brown. Anterior and ventral margins of pronotum black (Fig. 6C). Apical areas of all femora, basal and apical areas of all tibiae, and spines of hind legs black. Apices of spines of ninth abdominal tergite black.

Material examined. Holotype: male, Jinping, Funing, Yunnan, July 23, 2021, coll. by Wei Bin, Xiaoyu Peng & Xun Bian. Paratypes: 1 male and 1 female, the other information as holotype. Other specimen: 1 female, the other information as holotype.

Measurements (mm). Male: BL 15.9–16.1, PL 3.6–3.8, HFL 8.1–8.3; Female: BL 16.8–21.3, PL 4.2–4.4, HFL 8.6–9.9, OvL 7.1–7.5.

Distribution. Yunnan (Funing).

Discussion. The new species differs from congeneric species in: face with 1 longitudinal black stripe along the middle (Fig. 6A, 7A), median black band of pronotal disc narrow, spines of male ninth abdominal tergite slender (Fig. 6G), female subgenital plate longer than wide with posterior margin slightly arched (Fig. 7G).

Etymology. Name derived from Latin tenu (tenuous) plus spin (spine), referring to the posterior margin of male ninth abdominal tergite with 1 pair of tenuous spines.