Homogryllacris xizangensis Duan, Su & Shi, 2024

Duan, Yanhao, Su, Jie, Cai, Fanduo & Shi, Fuming, 2024, Two new species of the genus Homogryllacris (Orthoptera: Gryllacrididae) with the first description of the female of Homogryllacris foveolis Zhang, Pang & Bian, 2023 from China, Zootaxa 5523 (2), pp. 222-230 : 225-226

Homogryllacris xizangensis Duan, Su & Shi sp. nov.,

Chinese name ðDz同Bñ

( Figs. 2 , 4E–H )

Description. Body medium-sized for the genus.

Head. Face ovoid; fastigium verticis wider than antennal scape. Eyes ovoid, slightly protruding forward; ocelli indistinct.

Thorax. Pronotum broad and short, anterior margin slightly protruding forward, posterior margin straight. Lateral areas of second and third abdominal tergites each with two rows of stridulatory pegs.

Wings. Wings reaching middle areas of stretched hind tibiae. Male tegmen: R releases Rs before apical third of tegmen, both forked near apical area; left tegmen: MA free from base; CuA with a single branch at base that forks into two veins, shortly after the anterior branch divides again into two branches, MP and CuA1, the posterior branch (CuA2) does not divide further; right tegmen: MA forks before mid-length of tegmen into two veins, MA and MP; CuA unbranched, free throughout; both tegmina with CuP undivided, free throughout; with 4 anal veins. Female tegmen: R releases Rs before apical third of tegmen, both forked near apical area; left tegmen: MA divides into MA and MP, then MP divides again into 2 branches; CuA undivided, free throughout; with 3 anal veins; right tegmen: MA forks in apical area of tegmen into two veins, MA and MP, MP undivided; CuA near basal third divides into CuA1 and CuA2; with 4 anal veins; both tegmina: CuP undivided, free throughout.

Legs. Fore coxa with 1 spine at fore margin. Fore and middle femora unarmed; fore and middle tibiae with 4 pairs of moveable long spines and 1 pair of short apical spurs on ventral surfaces respectively. Hind femur with 11–14 inner spines and 8–10 outer spines on ventral surface; hind tibia with 5–6 inner spines and 6–7 outer spines on dorsal surface, bearing 1 pair of apical spurs on dorsal surface; ventral surface with 1 conspicuously long apical spur on inner margin, near basal area strongly curved dorsad, while outer margin with 2 apical spurs, and 1 pair of pre-apical spurs.

Male abdomen. Ninth abdominal tergite broad at base, narrowing. Tenth abdominal tergite very short, the middle of posterior margin with a pair of short posterior processes, basal areas stout, apical halves narrowing towards tips, apical areas sclerotized, slightly curved ventrad and inwards, tips subacute. Cerci conical with apices rounded. Subgenital plate quadrate, basal area slightly broad, posterior margin with semicircular notch in the midline, lateral lobe with apex rounded. Styli cylindrical, apices rounded, inserted on both sides of apical area of subgenital plate.

Female. Appearance is similar to that of male. Seventh abdominal sternite wider than long. Subgenital plate trapezoidal, basal area broad, narrowing, posterior margin slightly concave. Ovipositor straight and long, much longer than hind femur, dorsal and ventral margins almost parallel, apex rounded.

Coloration. Body light brown. Inner margin of antennal socket black, base and apex of antennal scape, base of pedicel and fastigium verticis with black spots. Eyes black, ocelli pale yellow. Genae under eyes with a brown spot separately. Pronotum with dark brown rim, disc with a broad longitudinal light red stripe in the midline, lateral lobe each with two irregular brown spots. Fore femur and tibia rosy as well as middle femur and tibia. Apical half of hind femur and hind tibia rosy. Dorsal surfaces of first to eighth abdominal tergites light red. Posterior margin of male ninth abdominal tergite with two brown spots. Apical areas of processes on male tenth abdominal tergite dark brown.

Measurements (mm). Body: ♂ 21.4–23.1, ♀ 25.1–34.3; pronotum: ♂ 4.5–4.7, ♀ 4.3–5.0; tegmen: ♂ 22.6–23.0, ♀ 21.4–22.7; hind femur: ♂ 12.1–13.1, ♀ 14.3–15.4; ovipositor: 26.8–26.9.

Material examined. Holotype: ♂, Mêdog, Nyingchi , Xizang, 9 July, 2023, coll. Yanhao Duan. Paratypes: 2♂ 1♀, same collection data as for holotype . Other specimens: 1♂, Mêdog, Nyingchi , Xizang, 3 July, 2023, coll. Yanhao Duan, Jie Su and Yonghui Li ; 1♀, Mêdog, Nyingchi , Xizang, 6 July, 2023, coll. Yanhao Duan, Jie Su and Yonghui Li ; 1♂ 1♀; Mêdog, Nyingchi , Xizang, 13 July, 2023, coll. Yanhao Duan, Jie Su and Yonghui Li.

Distribution. China (Xizang).

Etymology. The name of the new species derives from the type locality.

Discussion. The new species is similar to Homogryllacris obtusitubera Li, Dou & Shi, 2019 and H. erromena Duan, Su & Shi, 2023 with regard to the shape of posterior processes on male tenth abdominal tergite. It differs by posterior processes on male tenth abdominal tergite with tips subacute, not obliquely truncate as in Homogryllacris obtusitubera Li, Dou & Shi, 2019 and H. erromena Duan, Su & Shi, 2023 ; posterior margin of male subgenital plate with semicircular incision in the midline; lateral lobe of pronotum each with two irregular brown spots. Moreover, in two female specimens collected from the type locality, disc of pronotum with a broad and irregular longitudinal brown stripe in the midline, all veins of the tegmen are dark brown instead of rosy. These differences are regarded as individual variation and may partly also result from discoloration during conservation.

Figures

FIGURE 2. Homogryllacris xizangensis Duan, Su & Shi sp. nov., male: A. face; B–C. head and pronotum: B. lateral view; C. dorsal view; D–H. apex of abdomen: D, E. apical view; F. lateral view; G. dorsal view; H. ventral view; female: I. seventh abdominal sternite and subgenital plate; J. ovipositor in lateral view.

FIGURE 4. Tegmina of Homogryllacris spp. in dorsal view: A–D. Homogryllacris breviprocera Duan, Su & Shi sp. nov., A–B. male; C–D. female; E–H. Homogryllacris xizangensis Duan, Su & Shi sp. nov., E–F. male; G–H. female. I–J. female: Homogryllacris foveolis Zhang, Pang & Bian, 2023. Abbreviations: lt: left tegmen; rt: right tegmen.