Eugryllacris nigriabdominis Bin & Bian 2021, sp. nov.

Eugryllacris nigriabdominis Bin & Bian sp. nov.

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Figures 1– 2, 9E–F

Diagnosis. The new species can be recognized by the following: abdominal tergite black (Fig. 9E–F); cell of tegmina brown; posterior margin of male ninth abdominal tergite with 1 pair of small compressed spines, the spines of both sides crossing each other.

Male. Size normal for the genus. Face wide ovoid, nearly smooth, with scattered impressed dots; fastigium verticis broad, about 1.3 times as wide as scape, lateral margin not raised (Fig. 1A–B). Ocelli distinct, median ocellus large with upper margin almost straight and ventral margin semi-circular (Fig. 1A).

Wings considerably surpassing apices of hind femora (Fig. 9E–F). Tegmen (Fig. 2): Media arises from R in middle area, R forked near tip. Cubitus anterior forks into two branches, CuA1 and CuA2; cubitus posterior free, undivided. With 4 anal veins, the last two with common base. Hind wings slightly longer than tegmina.

Fore coxae with a small spine. Fore and middle femora ventrally unarmed; tibiae with 4 pairs of spurs and 1 pair of apical spurs on ventral surfaces. Middle tibiae with 1 dorsal spine on internal margin. Hind femora with 2–3 internal and 4–7 external ventral spines; tibiae with 6 pairs of dorsal spines, these becoming larger apically; ventral surface of tibiae with 1 pair of subapical spurs, apices with 1 pair of dorsal spurs and 2 pairs of ventral spurs.

Second and third abdominal tergites with two rows of very minute stridulatory pegs (Fig. 1F). Eighth abdominal tergite prolonged (Fig. 1H). Ninth abdominal tergite curved downward and slightly forward, the apical half split in midline, on both sides of split area with a subtriangular tubercle and below both tubercles with 1 small compressed spine which almost straight and invisible in dorsal view (Fig. 1I, K–L). Cerci longer, cylindrical, nearly straight (Fig. 1I). Subgenital plate wider than long, anterior margin arched concave; basal area of lateral margins convex, narrowing to apex; apical area narrower than basal, posterior margin slightly obtuse-triangularly concave (Fig. 1J). Styli inserted laterally at posterior margin of subgenital plate.

Coloration. Yellowish brown, frons greenish when alive. Cell of wings brown (Fig. 2). Abdominal tergite black (Fig. 9E–F).

Measurements (mm). Body w/wings: ♂ 38.1; body w/o wings: ♂ 28.8; pronotum: ♂ 7.1; tegmen: ♂ 26.8– 27.8; hind femur: ♂ 16.6.

Female. Unknown.

Material examined. Holotype: male (originally conserved in alcohol), Gulinjing, Maguan, Yunnan, July 28, 2021, coll. by Wei Bin, Xiaoyu Peng and Xun Bian.

Distribution. Yunnan (Maguan).

Etymology. The new speceis derives from Latin word nigr (black) and abdomin (abdomen) reffering the abdominal tergite almost black.