Arcifrons arcifrontalis Ding & Yang, 1986

Li, Hong-Xing, Yang, Lin & Chen, Xiang-Sheng, 2019, Redescription of Arcifronsarcifrontalis Ding & Yang, 1986 (Hemiptera, Fulgoromorpha, Delphacidae), ZooKeys 825, pp. 145-152 : 149-151

Arcifrons arcifrontalis Ding & Yang, 1986 Figures 1-4, 5-15, 17, 18

Arcifrons arcifrontalis : Ding and Yang 1986: 421; Ding 2006: 124.

Specimens examined.

17♂♂, 20♀♀, China: Yunnan, Yingjiang County (24°44N, 97°33E), on bamboo, 15 August 2015, Xiang-Sheng Chen and Lin Yang; 12♂♂, 18♀♀, Yunnan, Yingjiang County, on bamboo, 18 August 2018, Hong-Xing Li, Qiang Luo and Liang-Jing Yang.

Measurements.

Body length (from apex of vertex to tip of tegmina): male 3.2-3.5 mm (N = 17); female 3.4-3.8 mm (N = 20); tegmen length: male 2.7-3.0 mm (N = 17); female 2.8-3.3 mm (N = 20).

Coloration.

General color yellowish green (Figs 1-4). In dorsal view, a white large longitudinal stripe along median line from basal half of frons to the end of mesonotum (Fig. 5). Rostrum with apex dark brown. Eyes yellowish brown to blackish brown. Ocelli reddish brown. Pronotum with a white longitudinal band along lateral margin (Fig. 5). Tegulae yellowish white. Tegmina with white spots along longitudinal veins in apical half, along transverse vein and apical veins bordered yellowish brown stripes as figured (Fig. 8). Wings hyaline, with veins brown.

Head and thorax.

Ratio width of vertex at base to length 2.9-3.2, to width at apex 1.3-1.5, lateral margin slightly keeled, Y-shaped carina distinct (Fig. 5). Frons with ratio length to width 1.5-1.8, the widest at near ocelli. Ratio length of rostrum to width 7.4-7.6. Basal segment of antennae with ratio length to width 1.3-1.6, to length of second segment 0.5-0.6 (Fig. 6). Pronotum with ratio length in midline to length of vertex 2.2-2.4, anterior margin straight, posterior margin concave. Mesonotum in midline 3.5-3.8 times longer than pronotum, 2.4-2.7 times longer than vertex and pronotum combined (Fig. 5). Tegmina (Fig. 8) amply exceeding the tip of abdomen, 2.5 times longer than wide, with apical margin broadly rounded; Sc+R and M with common petiole at base, and forked before midline; Sc and R with two branches respectively; M with three branches at apical, M1 fused with Rs basally, and M3 fused with Cu1a basally; Cu with three branches; A with two branches fused at apical half.

Male genitalia.

Anal segment short, with inverse collar-shaped in posterior view, with lateral processes large and lamellate, apical margin roundly convex (Fig. 9). Pygofer with mediovental processes paired, finger-like, directed each other, opening oval, longer than wide, with ratio length to width 1.5 (Fig. 9), in profile with dorsal margin longer than ventral margin (Fig. 10). Aedeagus (Fig. 11) with phallobase distinct. Phallus tubular, with basal third exceeding the phallobase cephalad, and with apical fifth exceeding phallobase caudad, directed dorsad. Phallobase with apical two thirds narrowing apically, directed ventrad, dorsal margin with a stout tooth-like process at base and ventral margin with another small tooth-like process at basal third, in posterior view ring-like, opening narrow. Genital styles in profile (Fig. 13) with ventral margin distinctly convex, and with dorsal margin slightly concave, in posterior view (Fig. 12) moderately long, flake-shaped, broad at middle, apex acute, reaching the base of anal segment.

Female genitalia.

Anal style exceeded pygofer. Pygofer with gonocoxa VIII moderately large, basal third with inner lateral margin sinuate. Ovipositor longer than pygofer. Gonangulum small, with width wider than length, basal margin subangular convex in the middle, apical margin slightly convex, separated from gonocoxa VIII. Gonoplacs elongate, sword-like, with apex beyond apical margin of pygofer (Fig. 14). Gonapophyses IX (Fig. 15) slender, gradually narrowed apically, apex sharp, dorsal margin with apical half serrated.

Host plant.

Bamboo ( Phyllostachys sp.).

Distribution.

Southwest China (Yunnan Province) (Fig. 16).