Key to species of Omaliopsis of Asia

1 Each elytron with distinct pale macula..................................................................... 2

- Elytra without maculae, unicoloured...................................................................... 3

2 Each elytron with very wide macula covering most part of apical half of elytron; legs and antennomeres 1–5 yellow. Antennomeres 6–10 slightly elongate. Median lobe moderately narrow (Fig. 13). Body length: 3.14 mm. Habitus as in Fig. 1. China: Sichuan ........................................................................... O. amplimaculata sp.n.

- Each elytron with small round yellowish spot in middle; legs and antennomeres 1–5 reddish-yellow. Antennomeres 6–10 distinctly transverse. Median lobe markedly wide (Figs. 15–16). Body length: 2.92–3.35. Habitus as in Fig. 2. China: Yunnan ...................................................................................... O. bimaculata sp.n.

3 Head with markedly large eyes and indistinct temples. Apical part of aedeagus bilobed (Fig. 18). Body length: 3.30–3.60 mm. Habitus as in Fig. 3. China: Jiangxi, Hong Kong ................................... O. musaphila (Rougemont, 2017)

- Head with moderately small eyes and distinct short temples.................................................... 4

4 Pronotum widest about middle. Aedeagus as in Fig. 20. Body smaller: 3.15–3.54. Habitus as in Fig. 4. Nepal ................................................................................................... O. schmidti sp.n.

- Pronotum widest in anterior third,. Body larger: 3.50–4.30 mm. Northern India .......... .. O. himalayica (Cameron, 1924)