Key to species of Aquatica gen. nov.

1. Dorsally pale ................................................................................................................................ leii (Fu et Ballantyne)

- Dorsal surface always with dark brown elytra which may be pale margined .............................................................. 2

2. Pronotum with median dark marking ........................................................................................................................... 3

- Pronotum lacking median dark marking....................................................................................................................... 4

3. Pronotum reddish with median dark marking extending from anterior to posterior margins; aedeagus with inner

basal area of LL (view from above) toothed ..................................................................................... lateralis (Motsch.) - Pronotum yellowish with median dark marking not extending to posterior margin; aedeagus with inner basal area of LL not toothed ....................................................................................................................................... wuhana sp. nov. 4. Elytra with narrow pale band along suture, and lateral margins narrowly paler than rest; posterior area of aedeagal sheath sternite may appear strongly bent to right; inner margins of LL apices hooked .......................... ficta (Olivier)

- Elytra dark brown with no paler lateral margins; posterior area of aedeagal sheath sternite not bending strongly to right; inner margins of LL apices not hooked ............................................................................ hydrophila (Jeng et al.)