Tricentrus floripinnae Yuan & Cui, 1987

Li, Feng-E, Yang, Lin, Long, Jian-Kun, Chang, Zhi-Min & Chen, Xiang-Sheng, 2020, First Description of Adult Males of Four Species of the Treehopper genus Tricentrus Stål from China (Hemiptera, Membracidae, Centrotinae, Tricentrini), Zootaxa 4894 (2), pp. 247-260 : 252

Tricentrus floripinnae Yuan & Cui, 1987

Tricentrus floripinnae Yuan & Cui, 1987: 136 ; Yuan & Chou, 2002: 396.

Description. Body length (including forewing): male 4.4mm (N=1); forewing length: male 3.8mm (N=1); width between suprahumeral horn apices: male 2.0mm (N=1); width between humeral angles apices: male 2.2mm (N=1).

Coloration. Black with yellow hairlike setae, with the following parts yellow-brown except coxa, trochanter and femora of legs black and tibia brown: eyes, ocelli, and forewing. Basal quarter of forewing black, with the following parts dark brown: branch of R, a part of r-m, m-cu, short transverse band near middle of cell M 3+4 (last apical cell).

Head and thorax. Vertex with dorsal margin sinuate and ventral margin oblique; ocelli slightly closer to inner margin of eyes than to each other; frontoclypeal margins expanded gradually towards apex and apex truncate, frontclypeal lobes indistinct and basic margins arc, both distinguish by smooth belt ( Fig. 4A ). Suprahumeral horns short, not surpassing humeral angles, apices slightly curved back; posterior pronotal process ending at basal third of forewing cell M 3+4 (last apical cell), with median carina extended full length but indistinct, lateral carinae extended from base of posterior pronotal process to apex, ventral carina extended from basal quarter to apex ( Figs 4 B–4C). Basal fourth of the forewing sclerotized and distinctly punctate, veins M+Cu and R fused basally, M+Cu fused, diverging beyond basal fourth of wing ( Fig. 4D ). Metathoracic tibia with three rows of cucullate setae and trochanter with interlaced and strong processes ( Fig. 4M ).

Male genitalia. Pygofer nearly rectangular, dorsal margin convex in lateral view ( Fig. 4G ). Sternite IX longer than wide, and ventral margin sinuate ( Fig. 4J ). Lateral plate slightly depressed medially, with fingerlike dorsal lobe at base; apex acute ( Fig. 4F ). Basal five-sixths of subgenital plate fused ( Fig. 4H ). Style clasp angled dorsally ( Fig. 4G ); distally recurved and dorsal surface with setae; connective N-shaped ( Fig. 4L ). Aedeagus in lateral view hookshaped, narrow in anterior view, more than half of surface and margin with abundant coarse denticulation ( Figs 4I, 4K ).

Specimens examined. 1 ³, China: Yunnan, Menghai County, 14 July 2013, Mei-na Guo .

Distribution. China (Tibet, Yunnan).

Remarks. The dark brown mark in cell M 3+4 (last apical cell) of the forewing are important for identification of this species, as indicated in the original description. The specimens studied here were identified by this characteristic. However, the specimens from Yunnan lack a dark brown mark at the forewing apex. We think this difference represents intraspecific variation. Also, the climate and environment of the type locality, Motuo (Tibet), was similiar to that of Menghai (Yunnan). This is the first record of this species from Yunnan.

Figures

FIGURE 4. Tricentrus floripinnae Yuan & Cui, 1987 A, B, C) Male habitus, frontal view, lateral view, dorsal view. D) Forewing. E) Hindwing. F) lateral plate, posterior view. G, H, J) Male genitalia, lateral view, posterior view, ventral view. I, K) Aedeagus, posterior view, lateral view. L) Style, dorsal view. M) Metathoracic leg. Scale bars: 0.5mm (A–E, M), 0.2mm (F–L).