Miasa dichotoma Zheng & Chen

Zheng, Yan-Li, Yang, Lin, Chen, Xiang-Sheng & Luo, Xu-Qiang, 2018, Two new species of the genus Miasa Distant, 1906 from China, with a key to all species (Hemiptera, Fulgoromorpha, Dictyopharidae), ZooKeys 754, pp. 23-32 : 23-25

Miasa dichotoma Zheng & Chen sp. n. Figs 1-15, 16-20

Measurements.

♂, BL: 14.8-15.1 mm; HL: 2.0-2.3 mm; HW: 0.8-0.9 mm; FWL: 11.1-11.3 mm. ♀, BL: 15.6 mm; HL: 2.6 mm; HW: 1.0 mm; FWL: 11.5 mm.

Description.

General colour in dried specimens ferruginous-brown, marked with pale green and black. Cephalic process of the base brown, terminal black, brown on side. Frons uniformity brown. Frontoclypeal area dark with brown freckles. Compound eyes dark brown; ocelli light pink. Antennae brown. Pronotum and mesonotum brown, the median area emerald green. Forewings with stigmal area and posterior margin broadly dull ochreous, a large oblique triangular apical streak, and a narrow streak along nodal line fuscous; hind wings with an apical fuscous spot. Legs brown with dark spots.

Cephalic (Figs 1, 2, 5-7) process relatively long, distinctly upturned, ratio length to length of pronotum and mesonotum combined 0.8. Vertex (Figs 1, 2, 5-7) with lateral margins carinate, sub-parallel at base, sharply sinuate in front of eyes, then narrowing to arrowhead at apex, ratio of length to width between eyes 4.5. Frons (Fig. 6) elongate, median carina complete and elevated, length approx. 3.9 times long than width. Pronotum (Figs 1, 2, 5-7) distinctly shorter than mesonotum medially in the middle line, median carina obscure, lateral carina distinct, ratio length to length approx. 0.3:1. Mesonotum (Figs 1, 2, 5-7) median carina obscure, lateral carina distinct. Forewings (Figs 1, 8) elongate, with ratio of length to width approx. 4.0:1; CuA vein first branched before Sc+R and M veins near middle; crossveins very scarce, forming a nodal line along Sc+R, M and CuA veins at apical 1/3; apical cells approx. 10-12; Pcu and A1 veins fused into a long Pcu+A1 vein at apical 1/6 in clavus; stigmal area clear, with four cells. Legs long and thin, profemur not flattened and dilated, with one minute, short, blunt spine near apex; metatibia with 6 lateral black-tipped spines and 6 apical black-tipped teeth, hind tibiae I with nine and tarsomeres II with 8 black-tipped apical teeth, respectively.

Male genitalia. Pygofer (Figs 10-12) wider ventrally than dorsally (approx. 5.8:1), hatchet-shaped in lateral view. Gonostyles (Figs 10, 11) relatively large, broadening towards apex in lateral view (Fig. 10), posterior margin straight, upper margin with dorsally directed, black-tipped process near middle, with ventrally directed, hook-like process near sub-middle on outer upper edge. Anal tube (Figs 10, 12) wide and narrow down in dorsal view, ratio length to width approx. 1.1:1. Aedeagus (Figs 13-15) with one pair of special long endosomal processes, processes with apex acute, sclerotised and pigmented. Phallobase sclerotised and pigmented at base, with two pairs of membranous lobes at apex (Figs 13-15): the dorsal lobes relatively small and the ventral lobes large with complicated ventral lateral lobes in lateral view (Fig. 13), one pair of large lobes in dorsal view (Fig. 15), one pair of large and complicated lobes in ventral view (Fig. 14).

Female genitalia. Segment X (Fig. 17) round and large in dorsal view, ratio length to width at middle approx. 1.3. Gonocoxae VIII with two endogonocoxal processes membranous and flattened on endogonocoxal lobe. Gonopophyses VIII (Fig. 18) scle rotised with six differently sized teeth in lateral view. Gonopophyses IX (Fig. 19) triangular, symmetrical in ventral view, connected at base and separated from 2/3 base. Gonoplacs (Fig. 20) with two sclerotised lobes, ventral lobe with a membranous structure at the top, and lateral lobe with 3-4 long spines at apex.

Type material.

Holotype ♂, China, Yunnan, Xishuangbanna, Mengla, 23.VIII.2013, Guo Mei-Na. Paratypes, 1♀, same data as Holotype; 1♂, China, Yunnan, Xishuangbanna, Menglun, 30.VII.2012, Zheng Wei-Bin.

Distribution.

China (Yunnan).

Differential diagnosis.

This species is similar to M. trifoliusa sp. n. but can be distinguished from phallobase. The former has two pairs of membranous lobes of the phallobase at apex, the latter with three pairs of membranous lobes at apex.

Etymology.

This new species is named for the Greek word " dichotoma " referring to aedeagus that is dichotomous at its apex.