Key to species of Riseveinus Li, 1995 (males)

1. Head elongate, longer than combined length of pronotum and scutellum............................. R. albiveinus (Li)

- Head length less than or equal to combined length of pronotum and scutellum..................................... 2

2 Aedeagus without ventral process......................................................................... 3

- Aedeagus with ventral process........................................................................... 5

3 Aedeagus with small-spiculate lateral process (Fig. 24)......................................... R. spinatus sp. nov.

- Aedeagus without lateral process......................................................................... 4

4 Aedeagal shaft long and slender in lateral view, with pair of slender apical processes; dorsal apodeme with bilobed lateral extensions (Figs 8, 9)............................................................... R. cervcornutus sp. nov.

- Aedeagal shaft shaft broad at base, tapered to apex in lateral view, without pair of apical processes; dorsal apodeme with unpaired, bilobed, lamellate process, and asymmetrically curved process, longer than shaft, with compressed apex................................................................................ R. asymmetricus Zhang, Zhang & Wei

5. Aedeagus with unpaired ventral process................................................. R. baoshanensis Li & Li

- Aedeagus with pair of ventrolateral process................................................................. 6

6. Aedeagus ventrolateral process longer than aedeagal shaft..................................................... 7

- Aedeagus ventrolateral process shorter than aedeagal shaft..................................................... 8

7. Aedeagus with pair of slender apical processes.......................................... R. chiabaotawow (Huang)

- Aedeagus without pair of slender apical processes............................................. R. sinensis (Jacobi)

8. Aedeagus with pair of slender apical processes, anal tube without ventral process................................... 9

- Aedeagus without apical processes (Fig. 15), anal tube with barblike ventral process (Fig. 14)............................................................................................................... R. hamatus sp. nov.

9. Aedeagus ventrolateral process stout, and well separated from aedeagal shaft in caudo-ventral view; shaft apex inflated in caudo-ventral view (Fig. 33)............................................................ R. tenuispinus sp. nov.

- Aedeagus ventrolateral process slender, and close to aedeagal shaft in caudo-ventral view; shaft with parallel sided in caudoventral view.............................................................. R. compressus Zhang, Zhang & Wei