Arcofacies varius, Li & Yang & Chen, 2019

Li, Hongxing, Yang, Lin & Chen, Xiangsheng, 2019, Two new species of the bamboo-feeding planthopper genus Arcofacies Muir (Hemiptera: Fulgoroidea: Delphacidae) from China, Zootaxa 4706 (2), pp. 384-390 : 389

Arcofacies varius sp. nov.

( Figs 13–24 )

Measurements. Body length including forewing: male 2.9–3.0 mm (N = 2), forewing length: male 2.3–2.4 mm (N = 2).

Diagnosis. The salient features of the new species include the following: anal segment of male with lateroapical processes asymmetrical, left one distinctly longer than right one ( Fig. 21 ); pygofer in posterior view with 4 spinous medioventral processes ( Fig. 19 ); aedeagus with long spinous process at base, apex acute, directed ventrad, middle ventral margin of aedeagus without process ( Fig. 22 ); apex of genital style not forked ( Figs 23, 24 ).

Coloration. General color yellowish brown with green. Frons, vertex, pronotum and mesonotum with median carina white bordered with blackish brown ( Figs 15–17 ). Eyes dark brown to blackish brown; ocelli reddish brown. Antennae with dorsal and ventral margins and apex of scape, base and near apex of pedicel dark brown to blackish brown ( Fig. 16 ). Lateral margins of frons, gena, vertex and pronotum each with oblique white band bordered with brown or dark brown ( Figs 15, 16 ). Cypeus yellowish white ( Fig. 16 ). Forewings with yellowish brown over basal third, rest area hyaline, along transverse vein and apical veins with brown stripes as figured ( Fig. 18 ), in dark portion veins with white spots. Wings hyaline with brown veins. Legs yellowish brown. Abdomen with dorsum dark brown.

Head and thorax. Vertex ( Fig. 15 ) wider at base than long submedially about 1.55: 1. Frons longer in middle line than wide at widest part about 1.26: 1, widest just above ocelli.Antennae surpassing frontoclypeal suture, scape long equal to wide, shorter than pedicel about 0.38: 1 ( Fig. 16 ). Pronotum shorter than vertex about 0.70: 1. Mesonotum longer in middle line than vertex and pronotum combined about 1.84: 1 ( Fig. 15 ). Forewing in middle line longer than wide at widest part about 2.34: 1 ( Fig. 18 ).

Male genitalia. Anal segment of male short, lateroapical angles produced into stout spinous process respectively, asymmetric, left one distinctly longer than right one ( Fig. 21 ). Pygofer in posterior view ventral margin with four medioventral processes, finger-like ( Fig. 19 ), in lateral view ventral angles distinctly produced ( Fig. 20 ). Aedeagus ( Fig. 22 ) with long spinous process at base, S-shaped curved, apex acute, directed ventrad. Genital styles divergent, long, reaching ventral margin of anal segment, broad at base, narrowing to apex ( Figs 23, 24 ).

Type materials. Holotype ♂, China: Yunnan, Mengla County (21°55´N, 101°15´E), on bamboo, 26 Apr. 2015, Zheng-Xiang Zhou; paratype, 1♂, same data as holotype, Qiang Luo.

Remarks. This species is similar to A. strigatipennis Ding, 1990 but differs by: (1) anal segment of male with lateroapical processes asymmetrical, left one distinctly longer than right one ( Fig. 21 ) (anal segment with lateroapical processes symmetrical in A. strigatipennis ); (2) pygofer in posterior view with 4 spinous medioventral processes ( Fig. 19 ) (pygofer in posterior view without medioventral process in A. strigatipennis ); (3) aedeagus with long spinous process at base, middle ventral margin without process ( Fig. 22 ) (aedeagus broad at base, nearly quadrate, middle of dorsal margin and ventral margin each with process in A. strigatipennis ).

Etymology. The specific name is derived from the Latin word “ varius ” (meaning different, changeable), referring to the anal segment with two asymmetrical processes.

Host plant. Bamboo.

Distribution. China (Yunnan).

Figures

FIGURES 13–24. Arcofacies varius sp. nov. 13. Male habitus, dorsal view; 14. Same, lateral view; 15. Head and thorax, dorsal view; 16. Face; 17. Frons, lateral view; 18. Forewing; 19. Male genitalia, ventral view; 20. Same, lateral view; 21.Anal segment, right lateral view; 22. Aedeagus, left lateral view; 23. Genital style, ventral view; 24. Same, left lateral view. Scale bars: 0.5 mm (13, 14, 18); 0.2 mm (15–17, 19–24).