Acosmetura longielata sp. nov. Fig. 1

Type specimens. -

Holotype: CHINA • ♂, Guangdong, Ruyuan, Nanling, 15.VI.2019, leg. Tao Wang, MHU. Paratypes: CHINA • 2♂2♀, Guangdong, Ruyuan, Nanling, 15.VI.2019, leg. Tao Wang, MHU.

Description. -

Male. Body small. Fastigium verticis conical, narrower than antennal scape, blunt apically and grooved dorsally. Eyes faintly globular, obviously protruding forward and outward. Apical segment of maxillary palpus longer than subapical one; apex slightly swollen, truncate.

Pronotum long, distinctly prolonged posteriorly, reaching middle part of seventh abdominal tergite; anterior margin straight while posterior margin obtusely rounded (Fig. 1A), metazona rather strikingly elevated (Fig. 1B); lateral lobe longer than deep, metazona conspicuously extended ventrally, posterior margin without humeral sinus (Fig. 1B).

Tegmina short, completely covered by pronotum, overlapping, invisible in lateral view; hind wings absent.

All femora unarmed ventrally, genicular lobes with apices obtuse. Fore coxae with 1 short spine; tibiae with 5 spines respectively on both sides of ventral surface, tibial tympana open on both sides, ovoid. Middle tibiae with 5 inner and 6 outer spines on ventral surface. Hind tibiae with 2-3 spines on both sides of ventral surface as well as 22-26 spines on both sides of dorsal surface, bearing two pairs of ventral apical spurs and one pair of dorsal apical spurs.

Lateral margins of ninth abdominal tergite slightly prolonged posteriorly (Fig. 1C) and posterior margin of tenth abdominal tergite with a U-shaped concavity in the middle (Fig. 1G); epiproct triangular, apical area blunt, fused with tenth abdominal tergite. Cerci cylindrical, basal areas somewhat robust, tapering apically; subapical areas significantly bent dorsad, apical areas with a small spine (Fig. 1G-J). Genitalia sclerotized, not surpassing posterior margin of subgenital plate, apical area flat, tongue-shaped (Fig. 1I). Subgenital plate faintly trapezoidal, basal half slightly broad, with a triangular concavity at base, apical area with a V-shaped concavity; styli stout and short, inserted on apical areas of lateral lobes of subgenital plate (Fig. 1H).

Female. Pronotum slightly shorter than male, posterior margin reaching middle part of second abdominal tergite; anterior margin somewhat straight while posterior margin obtusely rounded (Fig. 1D); lateral lobe longer than deep, metazona gradually narrowing (Fig. 1E). Lateral margins and posterior margin of eighth abdominal tergite feebly expanded posteriorly (Fig. 1L). Tenth abdominal tergite a bit short, with a triangular concavity in the middle on posterior margin (Fig. 1K); epiproct peltate, blunt apically. Cerci conical, apical areas subacute. Subgenital plate nearly trapezoidal, basal area broad, lateral margins and apical area somewhat expanded dorsad while posterior margin straight; approximate lateral margins with a V-shaped carina (Fig. 1F). Ovipositor robust, apical half bent dorsad; dorsal and ventral margins smooth (Fig. 1L).

Coloration. -

Body yellowish green, green when alive. Eyes brown. Disc of pronotum with 1 broad longitudinal light brown stripe, of which lateral margins black-brown, outer margins of stripe with 1 longitudinal yellowish white stripe, not reaching posterior margin of pronotum (Fig. 1A, D). Dorsal surface of abdomen with 1 longitudinal black brown stripe in the midline. Posterior margin of male genitalia black-brown (Fig. 1I). Ovipositor light brown. Apices of all third segment of tarsi and claws blackish-brown and spines of hind tibiae black.

Measurements (mm). -

Body: ♂10.2-11.6, ♀11.4-12.9; pronotum: ♂7.5-8.6, ♀5.8-6.3; hind femora: ♂10.1-11.3, ♀11.8-13.0; ovipositor: 7.7-8.2.

Specimens examined. -

CHINA • 1♀, Guangdong, Ruyuan, Nanling, 11.VI.2019, leg. Tao Wang, MHU • 1♀, Guangdong, Ruyuan, Nanling, 13.VI.2019, leg. Tao Wang, MHU • 1♂, Guangdong, Ruyuan, Nanling, 15.VI.2019, leg. Tao Wang, MHU • 1♀, Hunan, Yizhang, Mangshan, 31.VII.2019, leg. Yarui Xin, MHU.

Distribution. -

China (Guangdong, Hunan).

Discussion. -

According to the caudal morphological characters of the male, this new species belongs to the genus Acosmetura . The differences between this new species and the known species of the genus Acosmetura are as follows: pronotum long, distinctly prolonged posteriorly, metazona rather strikingly elevated; female subgenital plate nearly trapezoidal, lateral margins and posterior margin somewhat expanded dorsad while posterior margin straight, approaching lateral margins with a V-shaped carina.

Etymology. -

The name of this new species is derived from the male pronotum that is long and the metazona that is strongly elevated. In Latin, " long -" means long and " elat -" means elevated.