Astatometopon gen. nov.

(Figs 1–32)

Type species. Astatometopon sakakibarai sp. nov., here designated.

Description. General body shape (Figs 1–5) oblong, slightly more than twice longer than wide.

Head (Figs 1–11) wider than or subequal in width to pronotum. Macrocoryphe (Figs 1–2, 4–5) quadrangular, wider than long; apex rounded; anterior side and posterior margin almost equal in width; posterior margin, in dorsal view, medially positioned at anterior half of eyes; coryphe composed by two pentagonal cells enclosed by carinae. Fastigium (Fig. 3) smoothly curved. Superior side of eumetope (Figs 6–11) wider than its inferior margin; carinae of metope fading on fastigium, then subparallel and converging on lower margin of eumetope; carinae sometimes weak, absent, or reduced to a single carina. Clypeus (Figs 6–11) tricarinate. Rostrum reaching mesocoxae. Antennae (Figs 6–11) with scape shorter than pedicel.

Thorax (Figs 1–5). Pronotum (Figs 1–2, 4–5) subtrapezoidal, wider posteriorly; posterior margin bisinuate; median carina distinct; lateral carinae curved laterally behind eyes, not reaching posterior margin. Mesonotum (Figs 1–2, 4–5) with median and lateral carinae distinct; median carinae fading at scutellum; scutellum transversely striated.

Legs. Metatibiae (Figs 14–15) with one lateral tooth near tibiofemoral articulation and another one near middle of its length. Calcar (Fig. 14) without teeth on its hind margin.

Male abdomen. Sternum I (Fig. 16) with apodemes short and directed dorsocaudad. Pygofer (Figs 17–18), in lateral view, higher than long; opening with no ventral processes; diaphragm strong, with armature. Segment X (Figs 19–21) wider than long, with pair of posteroventral processes. Segment XI (Figs 19–21) longer than segment X. Phallus (Figs 21–24) asymmetrical, with conspicuous porrect process arising from base. Suspensorium (Figs 21–24) ring-like, projected caudally over phallus. Styles (Figs 25–26) short, not surpassing height of diaphragm, narrowed at apex.

Differential diagnosis. See discussion.

Etymology. Combination of the Greek words αστατος (= astatos, inconstant) and μέτωπον (= metopon, forehead) in reference to the inconstant carination of the metope in the eumetope. Gender neuter.