Metanigrus guttatus Lv & Chen sp. nov. Figs 3, 4, 20-30

Measurements.

Total length: male 3.96-4.31 mm (N = 13), female 4.44-4.72 mm (N = 8).

Diagnosis.

The salient features of the new species include: the distal part of tegmina (Fig. 22) with a large black patch; dorsolateral part of anal tube (Figs 24, 27) with a stout finger-like process, a protrusion on the basolateral finger-like process; gonostyli (Figs 24, 27, 29) slender, inner process very narrow, apex of outer process nearly fan-shaped in lateral view.

Coloration.

General color yellowish white (Figs 3, 4). Frons whitish yellow. Clypeus black-brown. Vertex and pronotum white. Mesonotum brown. Eyes black. Legs yellowish brown. Tegmina semitransparent, with black patch near end. Wings hyaline. Abdomen brown.

Head and thorax.

Head (Figs 3, 20) significantly narrower than pronotum, without median carina. Vertex shorter in middle line than wide at base (1: 1.77), with two posterolateral areolets at base not meeting medially. Frons (Fig. 21) subrectangular, without median carina, longer in middle line than wide at widest portion (about 1.67: 1), lateral carinae with a dense row of sensory pits along outer margin. Postclypeus (Fig. 21) with distinct median and lateral carinae. Frontoclypeal suture nearly straight. Rostrum elongate, in repose well surpassing hind-coxae. Pronotum (Fig. 20) wider than maximum width of head (including eyes) (1.71: 1), with median carina and sinuate lateral carinae. Mesonotum (Fig. 20) about 4.57 times longer than pronotum in midline, with distinct median carina. Tegmina (Fig. 22) 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. 23) 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 24, 25, 27, 28) symmetrical, gradually narrowed towards apex, with sinuate anterior and posterior margins. Pygopher with internal sulcus, with slightly curved lateral margins in ventral view. Anal tube (Figs 24, 27) in lateral view, hand-shaped, anal style slender, lateral lobes distally shorter than anal style, dorsolateral part with a stout finger-like process, a protrusion on the basolateral finger-like process. Aedeagus (Figs 24, 26, 27, 30) 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 an acute and a nearly rectangular process; in ventral view, base wider. Gonostyli (Figs 24, 25, 27-29) slender, divided into two parts, inner process very narrow, curved apically, tapering into a process; in lateral view, outer process convex, apex nearly fan-shaped, inner margin with long setae; in ventral view, divergent, top of outer gonostyli with a pointed needle-like structure on the inner side.

Type material.

Holotype: ♂, China: Guizhou, Zhijin county (26°35'N, 105°53'E), 18 July 2020, Sha-Sha Lv; Paratypes : 12♂♂, Guizhou, Zhijin county, 18 July 2020, Sha-Sha Lv, Feng-E Li, Xiao-Ya Wang and Nian Gong ; 8♀♀, Guizhou, Zhijin county, 18 July 2020, Sha-Sha Lv, Feng-E Li and Nian Gong .

Etymology.

The species name is derived from the Latin adjective " Metanigrus guttatus ", referring to the tegmina with a patch.

Remarks.

This species is similar to Metanigrus chromus but differs from the latter in: (1) distal part of tegmina with a large black patch (distal part of tegmina without a large black patch in M. chromus); (2) frons without two brownish-black patches on both sides (frons with two brownish-black patches on both sides in M. chromus); (3) dorsolateral part of anal tube with a finger-like process (dorsolateral part of anal tube without a finger-like process in M. chromus).

Distribution.

China (Guizhou) (Fig. 61).