Acanthocinus

Key to the genera Acanthocinus and Leiopus, including new subgenus designations:

1 Elytra flattened towards apex (lateral view), with straight lateral margin towards outer apical angle (giving the appearance of a strongly elongated elytra), or antennae at least 3– 4 x longer than body in males, ovipositor very long................... 2

- Elytra sub-depressed and curved from ¾ towards apex (in lateral view), lateral margin straight to about halfway and thereafter weakly curved toward outer apical angle (giving the appearance of a less elongated elytra), antennae in males up to twice as long as body, ovipositor short............................................................................ 3

2 Elytra distinctly costate in most species. Ovipositor and last visible abdominal sternite strongly elongated in female. Antennomeres III–V densely fimbriate beneath in most species. Pronotum with 2–4 distinct, tufted anterior tubercles. Parameres mostly with a narrow apex (Fig. 84). Sclerites inside the internal sac usually forming a very long (> 10 mm), fine, weakly sclerotized, straight thread. Anterior margin of tergite VIII deeply notched (Fig. 98)................. Acanthocinus

- Elytra weakly costate. Ovipositor and last visible abdominal sternite very short in female. Antennomeres III–V not fimbriate beneath. Pronotum with 0–2 anterior tubercles. Parameres with a rounded apex (Fig. 83). Sclerites inside the internal sac double fork-like (apical part extended and distal part forming a shorter, curved fork-like part). Anterior margin of tergite VIII strongly elongated with a pointing (sharp) apex (Fig. 97)........... Acanthobatesianus subgen. nov. (genus Acanthocinus)

3 Elytra with weakly developed costae (Fig. 1), each elytron with a weak swelling at the base. The sclerites inside the internal sac are very short and usually form a straight shaft with or without a rounded head. The membrane of the internal sac has mostly very weak micro-reticulation................................................................. Leiopus

- Elytra with 4–5 clearly raised longitudinal costae (Fig. 16), each elytron with a strongly pubescent ridge at the base. The sclerites inside the internal sac in males are robust and fork-like in shape apically (Fig. 35). The membrane of the internal sac has very distinct micro-reticulation....................................... Carinopus subgen. nov. (genus Leiopus)