Larnaca (Larnaca) nigrifrons, Pang & Zhang & Bian, 2023

Pang, Siyu, Zhang, Qianwen & Bian, Xun, 2023, Contribution to the knowledge of Chinese Gryllacrididae (Orthoptera: Ensifera: Stenopelmatoidea) XXII: New descriptions from Southwest China, Zootaxa 5374 (4), pp. 487-504 : 499-502

Larnaca (Larnaca) nigrifrons sp. nov.

DZffiaedz

Figures 12–13

Description. Male. Body small with setae. Occiput convex. Fastigium verticis twice as wide as scape; fastigium frontis separated from fastigium verticis by a very fine suture ( Fig. 12A). Eyes oval, projecting outward. Median ocellus larger, nearly circular; lateral ocelli suited the lateral margins of fastigium verticis.

Anterior margin of pronotum faintly projecting, posterior margin nearly straight ( Fig. 12B); lateral lobes longer than high, anterior angle arched, lateral lobes with V-shaped furrow on each side ( Fig. 12C). Mesonotum and metanotum about half as long as pronotum, posterior angles rounded angular ( Fig. 12C).

Fore coxae with 1 small spine; fore and middle femora unarmed, tibiae ventrally with 4 pairs of spurs and 1 pair of apical spurs, the second spine obviously longer. Hind femora with 10–11 internal and 10–12 external spines on ventral surface; dorsal surface of tibiae with 6 pairs of spines and 1 pair of apical spurs, ventral surface with 2 pairs of apical spurs.

Wings smaller, latrad ( Fig. 12D). Tegmina subovate, reaching the posterior margin of mesonotum; hind wings sub-triangular, posterior margin truncate.

Second abdominal tergite with 1 short row and 1 long row of stridulatory pegs; third abdominal tergite with 2 subparallel rows of stridulatory pegs ( Fig. 12E). Eighth abdominal tergite prolonged backward ( Fig. 12F). Ninth abdominal tergite shorter than the preceding tergite, split along the midline, the lateral sides with convex base, ventro-internal angle of the swollen prolonged into a spine, its apices directing outward and slightly forward; in situ spines from both sides crossing each other ( Fig. 12G–H). Tenth abdominal tergite narrow, invisible in dorsal view. Cerci slender, nearly conical. Subgenital plate with basal margin straight, lateral margins convex, posterior margin angularly concave, the lateral lobes obtuse ( Fig. 12I). Styli long, about twice as long as the lateral lobes of subgenital plate, sub-cylindrical, apices obtuse, inserted at apico-lateral angles of the plate.

Female. Seventh abdominal sternite longer than wide, ventral surface obviously convex ( Fig. 13I). Subgenital plate short, basal margin with 1 pair of copulatory depressions, posterior margin widely rounded ( Fig.13I). Ovipositor falcate, most strongly upcurved in subbasal area, margins gradually approaching towards apex ( Fig. 13G).

Coloration. Body yellowish brown. Face and dorsal surface of head black ( Figs. 12A, 13A). Scape and pedicelli with basal areas black, flagellum with blackish ring on each segment. Ocelli yellowish or black. Pronotum yellowish brown with brown margins, anterior margins with 1 pair of black spots which connected in the middle ( Figs. 12B, 13C). Posterior margin of metanotum, and first to seventh abdominal tergites black. Basal areas of tibiae with black rings; spines of hind legs black, external surface with two rows of black spots ( Figs. 13G). Ovipositor brown.

Measurements (mm). Male: BL 16.83–21.08, PL 4.25–4.29, TL 1.71–1.78, HFL 9.69–11.73; Female: BL 16.83–20.44, PL 4.74–4.80, TL 1.89–2.01, HFL 9.29–9.84, OvL 9.24–10.48.

Material examined. Holotype: male, Xiniaogu, Yingjiang , Yunnan, August 21, 2023, coll. by Siyu Pang and Ting Luo . Paratypes: 1 male, Xima, Yingjiang , Yunnan, July 11, 2023, coll. by Weizhong Yang ; 1 male, Xima, Yingjiang , Yunnan, July 15, 2023, coll. by Weizong Yang ; 2 females, Xima, Yingjiang , Yunnan, August 11, 2023, coll. by Weizong Yang ; 5 females, Xima, Yingjiang , Yunnan, August 12, 2023, coll. by Weizong Yang ; 1 female, Xima, Yingjiang , Yunnan, August 18, 2023, coll. by Weizong Yang ; 1 male, Xima, Yingjiang , Yunnan, August 20, 2023, coll. by Weizong Yang ; 1 female, Xima, Yingjiang , Yunnan, August 21, 2023, coll. by Weizong Yang ; 1 female, Xiniaogu, Yingjiang , Yunnan, August 22, 2023, coll. by Siyu Pang and Ting Luo ; 1 male and 2 females, Xima, Yingjiang , Yunnan, August 27, 2023, coll. by Weizong Yang .

Distribution. Yunnan (Yingjiang).

Discussion. The new species differs from other species of the genus: wings latrad; face and dorsal surface of head black; male subgenital plate with posterior margin angularly concave, the lateral lobes obtuse; female seventh abdominal sternite without median groove.

Etymology. The new species is named with reference to the black face.