Longicornus Li

Fang, Yongqin & Xing, Jichun, 2018, Review of the leafhopper genus Longicornus Li & Song (Hemiptera: Cicadellidae: Deltocephalinae) with description of two new species, Zootaxa 4462 (3), pp. 435-442 : 435-436

Longicornus Li & Song

Longicornus Li & Song, 2008: 27; Li et al., 2011: 110; Zahniser & Dietrich, 2013: 152

Type species: Longicornus flavipuncatus Li & Song, 2008

Description. Body robust. Vertex with paired black transverse stripes on anterior margin. Pronotum with irregular

fuscous stripes. Face usually with dark, transverse streaks. Forewing brownish, with scattered unpigmented areas, veins dark brown. Hindwing macropterous. Legs dark brown.

Head including eyes narrower than greatest width of pronotum. Vertex with fore margin produced roundly, median length shorter than width between eyes. Eyes large. Ocelli on anterior margin, separated from corresponding eye by approximately their own diameter. Frontoclypeus distinctly longer than wide, anteclypeus expanded apically. Antennae arising near lower corner of eye. Pronotum with anterior margin roundly produced and posterior margin concave. Scutellum triangular, slightly shorter than pronotum, with transverse suture depressed. Forewing with four apical cells and three subapical, about 4 times as long as wide, appendix wide. Hindwing with three apical cells and two anteapical cells. Profemur with 2 dorsoapical setae, row AM with 1 stout seta, intercalary row with 15–17 setae, and row AV with several short setae in basal half. Protibia with 4 macrosetae in row AD and numerous macrosetae decreasing in length toward the base in row AV. Hind femur broadened distally and slightly bowed, apical setal formula 2+2+1. Hind tibia flattened and nearly straight, row PD with approximately 17 macrosetae decreasing in length toward the base; row AD with approximately 10 long stout setae and 2–4 shorter stout setae between each long seta; metabasitarsomere with four platellae and two setae on apical transverse row.

Male genitalia. Male pygofer side longer than high, with few stout setae posteriorly. Valve subtriangular. Subgenital plate with wide base, narrowed posteriorly, with setae along lateral margin, and mesal margin obviously deeply concave near apex. Aedeagus with shaft usually tapered to apex and curved dorsally, tubular, with pair of processes arising apically, or with pair of processes arising from ventral margin near base, or with two pairs of processes medially on dorsal margin; gonopore apical. Connective Y-shaped, with arms forked apically, stem very elongate, articulated with aedeagus. Style relatively narrow, apical process acute, turned laterally.

Remarks. The genus is similar to Matsumurella Ishihara, 1953 in general appearance, but can be distinguished from the latter by the broad subgenital plate with its mesal margin deeply concave near the apex and the male pygofer side not tapering to a caudal projection. The new genus is also similar to Scaphoidella Vilbaste, 1968 (e.g., S. undosa and S. wideaedeaga ) in general appearance, but can be distinguished from the latter by the mesally concave subgenital plate, aedeagus without basal processes, and elongate connective stem.

Distribution. Oriental Region ( China).

Note. The genus name Longicornus was reported to refer to the very long antennae (Li and Song 2008) but, in fact, the antennae are ordinary and not as long as in some genera in Stegelytrini.