Ocellarnaca nigra, Shi & Zhu, 2021

Shi, Fu-Ming & Zhu, Qi-Di, 2021, Further notes on the genus Ocellarnaca Gorochov, 2004 (Orthoptera Gryllacrididae) from China, Zootaxa 5068 (3), pp. 428-434 : 431-433

3 Ocellarnaca nigra sp. nov.

( Figs 3 , 4 )

Description. Body medium, stout. Head broad,face oval; frons smooth. Fastigium verticis broad, width as about two times as scapus width. Eyes ovoid, protruding forward and outward. Median ocellus large, oval, dorsal margin straight; lateral ocelli small, distinct. Pronotum broad and short, anterior margin protruding forward, posterior margin concave. Second and third abdominal tergites each with two rows of stridulatory pegs.

Wings comparatively short. Tegmen reaching posterior margin of eighth abdominal tergite; radius with two branches: media anterior has a common stem with radius, arising before the middle of radius, media posterior absent; cubitus anterior undivided; cubitus posterior undivided, free throughout; with 5 anal veins. Hind wings shorter than tegmina, not exposed, or slightly longer than tegmina.

Legs. Procoxa with a spine at fore margin, profemur and mesofemur unarmed on ventral surfaces, protibia and mesotibia with four pairs of long spines and a pair of short apical spurs on ventral surfaces. Postfemur with 14 spines on inner margin and 7 spines on outer margin of ventral surface; posttibia with 6–7 spines on two sides of dorsal surface separately, a pair of dorsal apical spurs and two pairs of ventral apical spurs; subapex of posttibia with a pair of spurs on ventral surface.

Coloration. Body light brown. Frons black, fastigium verticis with anterior area black. Gena distad of eye and under eye black. Clypeus and labrum brown, mandible black. Eyes brown; median ocellus yellowish white, lateral ocelli light yellow. Posterior margin of pronotum with a narrow black stripe along posterior edge, reaching posterior corners of lateral lobes. Procoxa with a black spine, basal and apical areas of profemur and mesofemur black, basal areas of protibia and mesotibia black. Apical area of postfemur and basal area of posttibia black, spines on postfemur and posttibia black, ventral surface of basal half of postfemur with a longitudinal black stripe. Tegmen and hind wing veins light, cells brown. Every abdominal sternite with a pair of black spots; first to seventh abdominal tergites with a transversal black stripe, eighth and ninth tergites dark brown.

Male. Ninth abdominal tergite shorter, apical area split, apex with a pair of stout and short conical projections, ventral surface of which with basal area broad spine-shaped hook, base broad, apical half narrow, twisted, apex acute. Subgenital plate broad and short, posterior margin indistinctively protruding backwards. Styli cylindrical, apices subacute. Cerci long conical, apices acute.

Female. Wings slightly shorter than these of male. Seventh abdominal sternite with base broad, apex rounded, with 2 small membranous extensions at hind margin. Ovipositor narrow and long, base obviously upcurved, other area almost straight; subapex slightly broadened, apex rounded. Subgenital plate broad and short, basal area broad, posterior margin concave.

Specimens examined. Holotype: male, Nonggang , Longzhou, Guangxi, China, 1 August 2018, collected by Qi-Di Zhu and Li-Xuan Chen . Paratypes: 1 male, Nonggang , Longzhou, Guangxi, China, 28 August 2012, collected by Jin-Rong Bai ; 1 male, Chongzuo, Guangxi, collected by Zhi-Lin Chen ; 1 male and 1 female, Zhubu , Longzhou, Guangxi, China, 17 July 2021, collected by Yun-Xiang Zhang and Meng An.

Measurement (mm). Body: ♂ 25.5–26.2, ♀ 27.5; pronotum: ♂ 6.5–6.7, ♀ 7.0; tegmen: ♂ 15.0–16.0, ♀ 15.5; postfemur: ♂ 15.3–15.5, ♀ 16.5; ovipositor: 19.0.

Discussion. The new species is similar to Ocellarnaca angulata Gorochov, 2004 , but differs from the latter in frons black.

Etymology. The new species is named for black frons; from Latin nigr - (black).

Figures

FIGURE 3. Ocellarnaca nigra sp. nov., male: A. head in fore view; B–C. head and pronotum: B. lateral view; C. dorsal view; D–G. apex of abdomen: D. lateral view; E. apical view; F. ventral view; G. apical view; female: H. seventh sternite and subgenital plate; I. ovipositor in lateral view.

FIGURE 4. Habitus lateral view, A. Ocellarnaca nigrofemora sp. nov.; B. Ocellarnaca nigra sp. nov.