Homogryllacris nigeriabdominalis sp. nov.

DZD同Dzae

Figures 3–4, 6C–D

Diagnosis. This species is similar to Homogryllacris anelytra as follows: body with minute wings which only reaching the middle area of mesonotum (Figs. 3C, 4C), but differs from the latter by: posterior margins of pronotum, mesonotum and metanotum and dorsal surface of abdomen black (Fig. 6C–D); the spines of male tenth abdominal tergite longer, reaching the middle area of seventh abdominal sternite (Fig. 3H); posterior margin of male subgenital plate rounded, the median concavity with the external margins longer than the internal margins (Fig. 3H); posterior margin of female subgenital plate with a triangular concavity (Fig. 4G). While Homogryllacris anelytra has only the seventh to ninth abdominal tergite black; the spines of tenth abdominal tergite reach the middle area of subgenital plate (Shi et al., 2012: Fig. 3D); posterior margin of male subgenital plate with wider concavity which the external margins slightly longer than the internal margins (Shi et al., 2012: Fig. 3G); posterior margin of female subgenital plate faintly concave in middle (Shi et al., 2012: Fig. 3J).

Description. Male. The following characters are in addition to those similar Homogryllacris unicolor ’s description. Hind femora with 12–17 internal and 9–10 external spines on ventral surface; hind tibiae with 7 internal and 6–7 external spines on dorsal surface.Wings reaching the middle area of mesonotum (Fig. 3C). Second abdominal tergite with 1 row of large stridulatory pegs and 1 row of extremely minute stridulatory pegs, third abdominal tergite with two rows of stridulatory pegs (Fig. 3D). Eighth abdominal tergite prolonged to backwards and ventrad. Ninth abdominal tergite semicircular. Tenth abdominal tergite with 1 pair of longer spines which reaching the middle area of seventh abdominal sternite (Fig. 3H). Subgenital plate longer than wide, the lateral margins convex, posterior margin obtusely rounded with 1 small triangular concavity in middle (Fig. 3H); the external margins of lateral lobes longer than the internal margins.

Female. Seventh abdominal tergite longer than other sterna, basal area with 1 pair of copulatory depressions (Fig. 4G). Intersegmental membrane between seventh sternite and subgenital plate shorter than the length of subgenital plate provided with faintly transverse folds (Fig. 4G). Posterior margin of subgenital plate with triangular and deeper concavity in middle (Fig. 4G). The average length of ovipositor about 1.14 times as long as body.

Coloration. Body yellowish brown. Internal margins and ventral margins of antennal cavities black, scape with blackish rings at basal and apical areas (Fig. 3A). Eyes black. Pronotal disc with blackish longitudinal band which deeper at posterior margin (Figs. 3B, 4B); posterior margins of mesonotum and metanotum black which widened in middle; dorsal surface of abdomen black (Fig. 6C–D). Spines of male tenth abdominal tergite brown (Fig. 3F). Ovipositor brown.

Material examined. Holotype: male, Bozhu, Wenshan, Yunnan, July 30, 2022, coll. by Xiangyi Lu and Xiaoyu Peng . Paratypes: 8 males and 2 females, other information as holotype.

Measurements (mm). Male: BL 14.5–16.5, PL 3.9 – 4.1, TL 1.2–1.4, HFL 9.1–9.6; Female: BL 17.9–18.7, PL 4.4 – 4.5, TL 2.0–2.2, HFL 10.8–11.3, OvL 20.3–21.6.

Distribution. Yunnan (Wenshan).

Etymology. Name derived from Latin niger (black) and abdomin (abdomen), referring to dorsal surface of abdomen black.