Metanigrus gremius Lv & Chen sp. nov. Figs 5, 6, 31-41

Measurements.

Total length: male 3.0-3.5 mm (N = 4), female 5.1 mm (N = 1).

Diagnosis.

The salient features of the new species include: general color (Figs 5, 6) yellowish white; dorsolateral and middle parts of anal tube (Figs 35, 38) each with a finger-like process; outer process of gonostyli (Figs 35, 38) convex and arcuate with nearly square process at apex in lateral view.

Coloration.

General color yellowish white (Figs 5, 6). Mesonotum light brown. Eyes black. Legs yellowish brown. Tegmina semitransparent. Wings hyaline. Abdomen yellowish white.

Head and thorax.

Head (Figs 5, 31) significantly narrower than pronotum, without median carina. Vertex shorter in middle line than wide at base (1: 1.99), with two posterolateral areolets at base not meeting medially. Frons (Fig. 32) subrectangular, without median carina, longer in middle line than wide at widest portion (about 1.93: 1), lateral carinae with a dense row of sensory pits along outer margin. Postclypeus (Fig. 32) with distinct median and lateral carinae. Frontoclypeal suture nearly straight. Rostrum elongate, surpassing hind-coxae. Pronotum (Fig. 31) wider than maximum width of head (including eyes) (1.43: 1), with median carina and sinuate lateral carinae. Mesonotum (Fig. 31) about 5.96 times longer than pronotum in midline, with distinct median carina. Tegmina (Fig. 33) slender, longer than maximal width (2.59: 1), almost as wide at postnodal as prenodal area, veins ScP + R + MP with several sensory pits, MP 3 two branched; five postnodal closed cells with C1 smaller than C2, C5 placed next to C3, C4 distally displaced after the nodal line, im, r-m and anterior two-thirds of margin with white areas. Hind wing (Fig. 34) with lateral margin notched at CuA1, CuP, and A2, more strongly at A1; A2 not reaching posterior margin. Metatibiotarsal formula: (3+5)-6-5.

Male genitalia.

Pygofer (Figs 35, 36, 38, 39) symmetrical, gradually narrowed towards the apex, with sinuate anterior and posterior margins. Pygopher with internal sulcus and slightly curved lateral margins in ventral view. Anal tube (Figs 35, 38) in lateral view, hand-shaped, anal style slender, lateral lobes distally shorter than anal style, dorsolateral and middle parts each with a finger-like process, basolateral side with a finger-like process. Aedeagus (Figs 35, 37, 38, 41) acuminate apically, with tubular periandrium, lateral lobes swelling on both sides, surface beset with scale-like productions, ventral lobe slender with acute apex, dorsal lobes with a short finger-like process; in ventral view, base wider. Gonostyli (Figs 35, 36, 38-40) divided into two parts, inner process curved apically, tapering into a process; in lateral view, outer process convex and arcuate with nearly square process at apex; in ventral view, divergent, inner part beak-shaped backward, apex of outer process nearly fan-shaped.

Type material.

Holotype: ♂, China: Yunnan, Daweishan National Natural Reserve (22°94'N, 103°70'E), 4 June 2016, Ying-Jian Wang; Paratypes : 3♂♂, Yunnan, Daweishan National Natural Reserve, 4 June 2016, Ying-Jian Wang ; 1♀, Yunnan, Daweishan National Natural Reserve, 4 June 2016, Qiang Luo .

Etymology.

The species name is derived from the Latin adjective " Metanigrus gremius ", referring to general yellowish white.

Remarks.

This species is similar to Metanigrus guttatus but differs from the latter in: (1) distal part of tegmina without large, black patch (distal part of tegmina with large, black patch in M. guttatus); (2) dorsolateral and middle parts of anal tube each with a finger-like process (only dorsolateral part of anal tube with a finger-like process in M. guttatus); (3) outer process of gonostyli nearly square at apex in lateral view (outer process of gonostyli nearly fan-shaped at apex in lateral view in M. guttatus).

Distribution.

China (Yunnan) (Fig. 61).