Nycheuma dimorpha (Matsumura, 1910)

Hou, Xiao-Hui & Chen, Xiang-Sheng, 2014, Revision of the planthopper genus Nycheuma Fennah (Hemiptera, Fulgoromorpha, Delphacidae), ZooKeys 462, pp. 47-57 : 49-50

Taxon classification Animalia Hemiptera Delphacidae

Nycheuma dimorpha (Matsumura, 1910) Figs 13-24

Dicranotropis dimorpha Matsumura, 1910: 37.

Nycheuma dimorpha (Matsumura), comb. by Asch 1988: 195.

Description.

Body length including forewing 3.20-3.36 mm (male), 4.20-4.32 mm (female).

Coloration. General color dirty yellowish brown to yellowish brown. Vertex, pronotum and mesonotum (Fig. 13) dirty yellowish. Frons and genae (Fig. 14) dirty yellowish brown, with several circular spots light yellowish brown. Clypeus (Fig. 14) dark yellowish brown. Eyes blackish brown, ocelli reddish brown. Antennae general dirty yellowish brown, with apex of scape ring with dark yellowish brown. Thorax with ventral parts light yellowish brown to yellowish brown. Legs with trochanters light yellowish brown to yellowish brown. Forewings (Fig. 15) hyaline, with apex of irregular spot brown. Abdomen with ventral parts dirty yellowish brown.

Head and thorax. Head including eyes wider than pronotum about 1.1:1. Vertex (Fig. 13) wider at base than long submedially about 1.4:1. Pronotum (Fig. 13) slightly shorter than vertex submedially about 0.8:1. Mesonotum (Fig. 13) longer than pronotum and vertex combined about 1.5:1. Frons (Fig. 14) longer in middle line than wide at widest part about 2.1:1, widest about level of ocelli, lateral carinae nearly straight below ocelli, median carina forked at level of ocelli. Postclypeus (Fig. 14) wider slightly at base than frons at apex, as long as wide at base. Rostrum reaching metacoxae, apical segment distinctly shorter than subapical. Antennae (Fig. 14) reaching frontoclypeal suture, basal segment longer than wide about 1.6:1, shorter than second about 1:2.1. Post-tibial spur with about 26 teeth.

Male genitalia. Anal segment of male (Figs 16, 17, 20) short, moderately, collar-like, lateroapical angles separated and produced into a stout spinose process. Pygofer in profile (Fig. 17) distinctly longer ventrally than dorsally, with laterodorsal angle not produced, in posterior view (Figs 16, 18) with opening as long as wide, lateral margin weakly defined, ventral margin concave, with 3 small medioventral processes, in ventral view pointed at different level. Phallus (Figs 20, 21) large, tubular, apex reflected cephalad at right, turned dorsad near apex, with 2 long, stout processes directed basad, one on apical fifth left, another on apical third right. Suspensorium (Fig. 22) Y-shaped, arms distinctly longer than stem. Diaphragm (Fig. 18) narrow, partly membranous, dorsal margin distinctly concave. Opening for genital styles small, dorsal and ventral margins evenly planus. Genital styles (Figs 23, 24) moderately long, divergent, slender, wider at base than at apex, inner base angle obvious, inner margin planus, outer margin slightly sinuate, with a nodule-like process nearly middle.

Material examined.

3♂♂, 2 ♀♀, CHINA: Datian National Natural Reserve (19°06'N, 108°47'E), Hainan Province, 12-15 Apr. 2009, collected by X.-H. Hou.

Host plant.

Unknown.

Distribution.

China (Hainan: Datian).