Genus Hainantettix Deng, gen. nov.

Type species: Hainantettix strictivertex Deng, sp. nov., here designated.

Redescription. General characters and coloration. Size small. Colouration uniformly dark brown or brown. Body interspersed with granules and sparse tubercles.

Head and eyes a little exserted above pronotal surface. Vertex very strongly narrowed toward the front drawing the eyes together and in front forming an acute arched shape, vertex about half the breadth of a compound eye. In frontal view, frontal costa bifurcated above lateral carinae, scutellum (longitudinal furrow) widely forked between antennae, the rami strongly divergent, width of longitudinal furrow of frontal ridge 1.6–1.8 times antennal groove diameter. In lateral view, frontal ridge nearly straight and visible between eyes, protruding anteriorly and nearly straight between antennal grooves. Antennae long, filiform, antennal grooves inserted below inferior margin of compound eyes. Eyes globose, lateral (paired) ocelli located lowest third of compound eye height.

Pronotum wide and short, in dorsal view dorsum of pronotum granulose and slightly rough, with straight anterior margin, posterior half with netted keels and notchs. Upper margin of pronotum in profile nearly straight, median carina entire; hind pronotal process wide, not reaching apex of hind femur and its apex narrowly rounded. Posterior angles of lateral lobes produced outwards, end of posterior angles slightly truncate or obtuse-rounded, posterior margins of lateral lobes of pronotum only with ventral sinus. Tegmina and hind wings absent.

Legs. Fore and middle femora slightly compressed, margins finely serrated, with carinated and slightly undulated ventral margins. Hind femora robust and short, with carinated and smooth dorsal and ventral margins. antegenicular denticles right angle and genicular denticles acute; length of first segment of hind tarsi longer than third.

Diagnosis. New genus can be easily distinguished from other genera of the subfamily Cladonotinae by vertex very strongly narrowed toward the front drawing the eyes together and in front forming a triangular shape. Similar to Epitettix Hancock and Pseudepitetti x Zheng, but differs by follows: anterior margin of fastigium of vertex narrowly arched in Hainantettix, anterior margin of fastigium of vertex generally truncate or slightly arched in Epitettix Hancock, 1907 and Pseudepitetti x Zheng, 1995.

Etymology. The new genus was named after the type locality, Hainan, China; adjective.