Usana Distant, 1906

Long, Jian-Kun, Yang, Lin & Chen, Xiang-Sheng, 2015, Six new species of the planthopper genus Usana Distant, 1906 (Hemiptera: Fulgoromorpha: Achilidae) from China, Zootaxa 3947 (4), pp. 489-507 : 490

Usana Distant, 1906

Usana Distant, 1906: 293 ; Fennah, 1950: 132; Fennah, 1978: 249; Chen et al., 1989: 23. Type species: Usana lineolalis Distant, 1906 .

Description. The distinctive characters used by Fennah (1950) and Chen et al. (1989) are modified as follows.

Mid-sized species. Width of head with eyes 0.8–0.9 times wider than pronotum. Vertex not declivous, produced before eyes about 1/3 of its length, median carina distinct, disk not or almost not depressed, anterior margin carinate, obtusely subangulately (about 130 degrees) or slightly convex, triangular areolets at lateroapical angles of head distinct, lateral margins carinate and straight, diverging basad, posterior margin broadly concave . Frons slightly convex in lateral view, upper margin (apex) truncate, median carina percurrent, lateral margin carinate, sinuately diverging to the level of antennae thence gradually incurved to suture. Clypeus with tricarinae distinctly. Rostrum almost or just reaching post-trochanter, with subapical segment shorter than apical segment. Antenna subglobose, not sunk in a depression. Ocelli separated from eyes. Eyes almost not excavate beneath, and slightly overlapping pronotum in dorsal view. Pronotum with length in midline as long as behind eyes, anterior margin of disk broadly convex, posterior margin subangulately excavate about 115 degrees; median carina distinct, lateral carinae straight, parallel or slightly diverging rearward, attaining hind margin, each with length 1.4 times longer than median carina; lateral lobe not inclined antero-ventrally, with a small longitudinal carina between eye and tegula. Mesonotum with length in midline longer than vertex and pronotum combined, tricarinate. Forewing with costal margin slightly convex, apical margin broadly convex, posterior margin with a reentrant angle of 155 degrees at apex of clavus, vein Sc+R forking proximally, distally or same as level of Cu1 fork, vein M forking basad of the node, vein Cu1 forking slightly distal union of claval veins, clavus terminating, or slightly distad of middle of forewing. Hindwing with 2 branches of veins M and Cu1 respectively. Post-tibiae with a lateral spine between basal 1/3 to near basal 1/2, spinal formula 7–7 (6)–7 (6).

Male genitalia. Anal segment in dorsal view with length at least as long as width, apical margin distinctly excavate in midline; Pygofer in lateral view with dorsal margin distinctly shorter than ventral margin, medioventral process entire or with apex divided into 2 branches. Genital style with 3 processes rising from its dorsal margin, inner surface near anterior margin with a long process, directed outwards. Phallobase sheath-shaped, generally asymmetrical, with apical 1/2 divided into a dorsal, 2 lateral and a ventral lobes, the former relatively short, the lateral lobes valviform, and the latter with apical margin incised in the midline, subapical surface of ventral lobe in middle gives rise to a long process, directed basad. Each phallic appendage generally not exceeding apical margin of phallobase, with a corner between basal 1/4 to 1/3.

Distribution. Oriental and Palaearctic regions.