Description of a new species of the leafhopper genus Zyginella Löw from Southwest China (Hemiptera, Cicadellidae, Typhlocybinae)

Abstract A new species, Zyginella menghaiensis sp. n. (Hemiptera: Cicadellidae: Typhlocybinae: Zyginellini), is described from Chinaand a key to species of Zyginella from China is provided.


Introduction
The leafhopper genus Zyginella was established by Löw in 1885. The genus belongs in the tribe Zyginellini of Typhlocybinae and consists of twenty-two species distributed in the Oriental, Palaearctic and Afrotropical Regions. Members of the genus can be distinguished by the distinct dark spot on the 3rd apical cell of the forewing (Fig. 3) and in the male genitalia by the male pygofer with short ventral caudal process and long macrosetae on the posterodorsal margin (Fig. 5) and style elongate, slender throughout length with truncate base (Fig. 7). Recent taxonomic work on the genus includes Dworakowska (1969Dworakowska ( , 1970Dworakowska ( , 1974Dworakowska ( , 1977, Chiang, Lee and Knight (1988) and Zhang (1990); up to now, eight species of Zyginella have been recorded from China in these studies. In the current work, a new species from Yunnan Province, China is described and illustrated and a key to Chinese species of Zyginella is given. All specimens examined are deposited to the collection of the Insititute of Entomology, Guizhou University, Guiyang, China (GUGC).

Key to Chinese species of the genus Zyginella (males only couplets 5-7)
1 Vertex with black stripe between eyes subapically (Fig. 12)  Forewings without a large rhombus-like patch along inner margin subbasally (Fig. 3)  Aedeagal shaft with a single short dorsal process subapically (Figs 8, 9)  Description. Head and thorax yellowish brown; vertex with lateral margins with soft red tinge; eyes brownish grey; pronotum brownish with two longitudinal darker stripes; scutellum with basal triangles testaceous. Forewing (Fig. 3) reddish brown near base, dark red between 4th apical cell and brochosome-field and light brown around apex; 3rd apical cell with a blackish brown spot. Coronal suture (Fig. 1) extending nearly to anterior margin of vertex. Forewing (Fig. 3) with 3rd apical cell not petiolate at base.
Abdominal apodemes (Fig. 4) slender, slightly extended beyond 4th sternite. Pygofer lobe (Fig. 5) broad, with a large sclerotized process near dorsal margin and another process arising from about ventro-caudal margin; six long macrosetae distributed along caudal margin and numerous short microsetae scattered on lateral surface. Subgenital plate (Fig. 6) long, gradually tapered towards apex and curved apically, beak-like; with three long macrosetae along upper margin. Style (Fig. 7) elongate, slender throughout length with truncate base. Aedeagal shaft (Figs 8,9) curved dorsad in lateral view with single small dorsal process subapically; gonopore large, apical on ventral surface with small tooth on each lateral margin; preatrium long, about as long as aedeagal shaft; dorsal apodeme narrow. Connective (Fig. 10

Remarks.
The new species is similar to Z. tsauri Chiang, Hsu and Knight (1989), but the forewing has a large dark costal patch (Fig. 3) and the aedeagus has a single short dorsal process subapically and a small tooth on each lateral margin of the gonopore (Figs 8, 9).
Etymology. The new species is named for its type locality: Menghai.