Idioceroides Matsumura, 1912

Zhang, B. & Viraktamath, C. A., 2009, New placement of the leafhopper genus Idioceroides Matsumura (Hemiptera: Cicadellidae: Idiocerinae), with description of a new species, Zootaxa 2242 (1), pp. 64-68 : 65

Idioceroides Matsumura

Idioceroides Matsumura, 1912: 279 ; Maldonado-Capriles, 1976: 139, Figs 1 –10. Type species: Idioceroides tettigoniformis Matsumura, 1912 , by original designation.

Sexually dimorphic both in facial structure and coloration. Head short, slightly wider than pronotum. Vertex roundly produced and parallel-sided, upper part of face and vertex arcuately rugose. Face slightly wider across eyes than long, shagreen. Ocelli quite high on face, closer to eyes than to each other. Lateral frontal sutures present, not reaching ocelli. Lateral margins of genae concave. Frontoclypeus large, trapezoidal. In male, clypellus strongly expanded in basal half, apex narrow, lora narrow and elongate. In female, face more normal, with clypellus broad at base and narrowed at apex, depressed in apical half; lora wider than in male. Pronotum shagreen; anterior margin convex, sides rather short, hind margin concave, more so in female than in male. Scutellum longer than pronotum. Forewing with four apical and three subapical cells, inner subapical cell closed basally, vein R with two branches, crossvein is present, appendix well developed but narrow. Hind femora with 2+1 apical setae. Hind tibial chaetotaxy R 1 10±1, R 2 11±1, R 3 22±2.

Male pygofer elongate, without basal fracture, without ventral or caudal processes. Tenth segment with well developed anal collar process. Valve with square tipped anterior margin devoid of apodemes, caudal margin roundly produced. Subgenital plates more than five times as long as wide, not exceeding ventral margin of pygofer, with a few short setae. Style long, narrow, strongly dorsally curved at distal apex. Connective T-shaped, stem narrow and long. Aedeagus elongate, with basal half slender, shorter than rather cylindrical shaft, with processes at distal end; gonopore apical.

Female with pregenital (seventh) sternite relatively long; first pair of valvulae slender, with strigate sculpturing reaching dorsal margin, apex pointed; second pair of valvulae with dorsal marginal teeth in distal 0.5-0.6 length.

Distribution. China: Taiwan, Sichuan.

Remarks. Maldonado-Capriles (1976) transferred the genus to Agalliinae erroneously. Although the genus is atypical within the subfamily in having a relatively narrow appendix of the forewing and ocelli high on the face, the following characters confirm its placement in Idiocerinae : vertex and upper part of face arcuately rugose, presence of rather well developed frontal sutures on the face, unforked elongate apophysis of the male style, elongate subgenital plates and T-shaped connective. Among the Idiocerinae , the genera Tasnimocerus Ghauri (1975) and Namiocerus Ghauri (1985) also possess ocelli quite high on the face, and the former also has the appendix of the forewing relatively narrow. However these genera have the pronotum transversely rugose or striate, respectively and in the latter the frontal sutures reach the ocelli. The male genitalia of Tasnimocerus also resemble those of Idioceroides , but in the former the processes of the aedeagal shaft are close to its base whereas in the latter they are placed distally on the shaft.

Figures

FIGURE 1. Idioceroides sichuanensis n. sp. A, Dorsal head and thorax of male; B, profile of head of male; C, face of male; D, left forewing of male; E, valve; F, male pygofer, anal tube and subgenital plate, lateral view; G, style and connective, lateral view; H, aedeagus, lateral view; I, aedeagus, ventral view.