Orophyllus nigrisartorius Xie, Wang & He sp. nov.

Figs. 3A–J

Material examined: Holotype: 1 male, CHINA, Guizhou Prov., Leigongshan (108.18°E, 26.37°N), alt 1500m, 14- viii-2020, coll. Xie Hui-Cong (ECNU).

Paratype: 2 females, CHINA, Guizhou Prov., Leigongshan (108.18°E, 26.37°N), alt 1500m, 14-viii-2020, coll. Xie Hui-Cong (ECNU) ; 4 males, CHINA, Sichuan Prov., Mount Emei (103.40°E, 29.57°N), alt 700m, 2–4-viii-2007, coll. Liu, Huang, Zhou & Bi (SEM) ; 1 male, CHINA, Sichuan Prov., Qingchengshan (103.55°E, 30.90°N), 7-v- 1985, coll. Liu Xian-Wei (SEM) .

Description: Male: Medium size, larger than O. montanus . Fastigium of vertex tapered, slightly exceeding the base of antennal socket, with a longitudinal groove posteriorly. Frons relatively flat and nearly square (Fig. 3A). Anterior margin of pronotum slightly convex, posterior margin broad and rounded; surface of disk almost smooth, with 2 transverse grooves, posterior transverse groove positioned behind the middle (Figs. 3B, C). The anterior margin of tegmina arched while posterior margin nearly straight, the length from Rs to R greater than to M of the tegmina, and the length from M to Cu as same as to Rs. The middle portion of Sc close to R, and the tip of tegmina blunt. Hind wings shorter than tegmina and transparent. Fore coxae with a spine. Fore femur longer than pronotum. Both dorsal carinae unarmed. Fore femur ventrally with 4–7 inner spines, mid femur ventrally with 6–9 inner spines, hind femur ventrally with 9–13 inner spines. Hind femur with black stripe on internal surface (Fig. 3F). Prosternum unarmed, meso- and metasternum strongly transverse, the former with entire, non-crenellated anterior margin (Fig. 3D). Epiproct ovoid, length almost equal to width, slightly concave apically. Cerci relatively longer and slender, longer than epiproct, and curved inwards apically. Subgenital plate gradually narrows toward the apex, base with membranous part and gaped in dry specimen, the tip stalk-shaped. Styli very long, wide at the base, narrowing towards the end, and pointed in terminal (Figs. 3G, H).

Female: Much larger than the male. Tegmina slightly recurved at apex. Epiproct long tongue-shaped or rectangular, nearly 1.5 times as long as wide. Cerci elongate and conical, curved inwards apically. Ovipositor robust, longer than length of hind femur, with a curved ventral edge, the apical area with 4 fine, sharp angled folds. Dorsal margin of the ovipositor not as straight as in O. montanus, basal half of the dorsal valve straight, the dorsal margin of the apical half narrowred toward the ventral surface; distal half of dorsal margin armed with fine teeth (Fig. 3J). The basal panels of subgenital plate expanded at inner apex to triangular lobules, the apical lobe of the subgenital plate with a narrow but deep notch (Fig. 3I).

Measurements (in mm): Male: SZ 44.3–52.28, PR 6.2–7.15, FW 36.5–42.64, HF 16.9–19.95; Female: SZ 69.27–71.94, PR 8.93–9.13, FW 58.87–60.39, HF 24.64–24.65, OV 33.36–34.26.

Etymology: Species name nigrisartorius means a black stripe inside the hind femur, its position just like the sartorius muscle to human thigh.

Distribution: Guizhou, Sichuan.