Male. Body dark brown or black (Fig. 13). Face black, eyes brown or black, ocelli pale yellowish and upper lip yellowish brown. Antennae black, terminal segments light brown. Abdominal sternites reddish brown with the middle of anterior three sternites brown (Fig. 14). Legs reddish brown with coxae and trochanter brown, tarsal pulvilli pale (Fig. 14).

Vertex slightly punctate, exposed (Fig. 49). Face punctulate, ocelli small, round. Pronotum transverse ovate and flat; anterior margin convex or straight, center weakly concave, lateral corners of the indentation slightly incrassate and upturned; lateral margins convex and widest at or before the midline; hind margin straight; anterior 1/3 of pronotum shallowly depressed and delineated by two grooves, the surface sparsely granular; posterior half flattened and punctate densely, with two small disc tubercles (Fig. 49). Tegmina and wings well developed (Figs 50–51), extending to or surpassing the tip of abdomen (Fig. 13), few reaching to the hind margin of 6^th tergite, sometimes mutilated terminally. Anterior ventral margin of front femur with 0–1 spine and with a small distal spine, hind margin with a large distal spine. Abdominal tergites punctate, with punctations denser caudally, anterolateral corners without holes. Caudal angles of 6^th tergite weakly extended; lateral margins of 7^th tergite smooth, caudal angles acute and directed caudally (Fig. 52). Abdominal sternites punctate, hind margin of the 7^th sternite weakly concave and subgenital fig exposed (Fig. 53). Supra-anal fig punctate densely, hairless, hind margin smooth or slightly concave in the middle in dorsal view, with 5–7 small teeth medially or smooth in ventral view, caudal angles small (Fig. 55). Cercus fin-shaped with acute apex, dorsal surface without setae and hairy ventrally (Fig. 54). Hind margin of subgenital fig rounded (Fig. 55).

Male genitalia. Genital phallomere well developed, L1 well sclerotized (Fig. 56); L2vm rod-like, L2d elongate (Fig. 57); R2 hook-shaped (Fig. 58).

Female. Differs from male as follows: the anterior margin of pronotum weakly concave and the corners not upturned; the tubercles on surface smaller than in male. Hind margin of S7 rounded.

Nymph. Body black and punctuate, with two yellowish brown marks on the mesonotum and metanotum without marks (Figs 15–16).

Measurements. Male, body length: 24.5–27.0 mm; pronotum: length/width: 4.2–5.2/ 7.9–9.0 mm; width of excision of anterior margin of pronotum: 1.5–1.8 mm; distance between disc tubercles: 1.1–1.5 mm; tegmen: 22.0–25.6 mm.

Female, body length: 26.8–31.5 mm; pronotum: length/width: 4.5–5.0/8.5–9.0 mm; width of excision of anterior margin of pronotum: 1.1–1.3 mm; distance between disc tubercles: 1.3–1.5 mm; tegmen: 21.2–23.2 mm.

Holotype, male, China: Guizhou Prov., Zunyi City, Suiyang County, Kuankuoshui Natural Reserve, 14 August 2010, coll. Keliang Wu (SWU). Paratypes, five males, two females and five nymphs, same data as holotype (SWU); four males, 12 females and 13 nymphs, Guizhou Prov., Zunyi City, Suiyang County, Kuankuoshui Natural Reserve, 1–2 August 2013, coll. Xiudan Wang and Yuhong Zheng (SWU).

This species is similar to Panesthia angustipennis spadica, but can be distinguished by the following characteristics: 1) anterior margin of pronotum weakly concave in male, and without mesal elevation, male of latter with anterior margin broadly excised and with mesal elevation; 2) body length < 30 mm in most, or few surpassing 30 mm, body length of Panesthia angustipennis spadica > 30 mm.

The specific epithet is named after the locality of the holotype, Guizhou Province.