Symplanella nigricans Gong & Chen, sp. nov.

Figs 15–34

Measurements. Body length including forewing: male 6.1–6.2 mm (N = 3); forewing length: male 5.1–5.2 mm (N = 3).

Diagnosis. Anal segment very short (Figs 22–23); posterior margin of pygofer in lateral view broadly concave, one finger-like process at dorsal third, small (Fig. 23); genital style with two processes (Fig. 25); aedeagus tubular, slender and long, without process, opening dorsally at apex half, apex divided into two lobes (Figs 27–28).

Description. Coloration. Body mainly black brown with somewhat yellow (Figs 15–19). Ocelli (Fig. 19) slightly red, semi-translucent; eyes (Figs 17–19) taupe. Antennae (Figs 18–19) with one black spot at apex of pedicel. Frons (Fig. 18) with areas between sublateral carinae mostly black brown, lateral areas tawny. Clypeus (Fig. 18) black. Forewings (Figs 15–16) subhyaline, veins brown. Hind wing hyaline, veins slightly brown. Abdominal sternites black brown with somewhat green. Tergites black brown. Spines of legs with black apices.

Head and thorax. Width of vertex including eyes as wide as pronotum. Vertex (Fig. 17) as long as wide. Frons (Fig. 18) 1.5 times longer in middle line than widest part. Pronotum (Fig. 17) shorter in middle line than vertex (1:1.1). Mesonotum (Fig. 17) 1.1 times longer than pronotum and vertex combined. Forewings (Fig. 20) 4.3 times longer than wide; veins obviously forming a nodal line, ScP + R and MP with common stem; after the nodal line, RP single, MP with four branches, CuA with two branches; Pcu uniting A1 at basal 2/5 of clavus. Hind wing (Fig. 21) 2.1 times as long as broad at widest part, ScP and RP single, MP and CuA with two branches.

Male terminalia. Anal segment (Figs 22, 23) tubular, short, in lateral view (Fig. 23) dorsal margin waved, ventral margin slightly convex; 1.6 times wider than length in dorsal view (Fig. 22). Ventral margin of pygofer in lateral view (Fig. 23) strongly oblique, posterior margin broadly concave, one finger-like process at dorsal third; in posterior view (Fig. 24) nearly oval, with length 1.8 times than widest part; in ventral view (Fig. 26), posterior margin sinuate, anterior margin broadly convex. Genital style in lateral view (Fig. 25) with median portion broad, large, with apical margin obtuse convex; dorsal margin with basal half dorsally uplifted and branched into two processes, the basal one curving, long and thin, with apical margin narrow convex, the apical one stout with apical margin broadly concave; in ventral view (Fig. 26) nearly petal-shaped. Aedeagus in lateral view (Fig. 27) with base slightly broad, apical part mostly slender, ventrally bend, opening dorsally at apex half, apex divided into two lobes.

Female terminalia. Abdominal sternite VII (Figs 30, 32) in ventral view symmetrical, posterior margin concave and slightly protruded medially, with a small triangle-like hole near the posterior margin medially. Anal tube (Figs 29, 31) short. Gonapophysis VIII (first valvula) (Fig. 33) elongate, with six spines at apical margin. Gonapophysis IX (second valvula) (Fig. 34) with two lobes symmetrical, each lobe with much spines at apical margin and dorsal margin. Gonoplac (third valvula) with outer surface shagreen (Figs 29, 30); in lateral view (Fig. 29) with median portion broad, large, apical margin convex; in ventral view (Fig. 30) blade-like.

Type material. Holotype: ♂, China: Yunnan Province, Yingjiang County, Nabang Town (24°70′N, 97°90′E), on bamboo, 18 August 2018, Nian Gong leg. Paratypes: 5♂♂, 7♀♀, data same as holotype, Hong-Xing Li leg.; 2♂♂, 4♀♀, China: Yunnan Province, Ruili County, near the Botanical Garden (24°01′N, 97°85′E), on bamboo, 23 August 2018, Nian Gong and Hong-Xing Li leg.

Host plant. Bamboo ( Neosinocalamus sp.).

Distribution. China (Yunnan).

Etymology. The specific name is derived from the Latin word “ nigricans ”, referring to the color of the face.

Remarks. This new species is similar to S. zhongtua, but differs in: 1) segment very short (relatively long in S. zhongtua); 2) posterior margin of pygofer in lateral view broadly concave, one finger-like process at dorsal third, small (posterior margin slightly sinuate, process at middle, relatively big in S. zhongtua); 3) genital style with two processes (without process in S. zhongtua).