Key to species of the genus Taperus Li & Wang based on male adults

1. Aedeagal shaft with angulate posterior process near base (Figs 22, 27); footlike apical process of style with apex very long and slender, at least one third length of style (Figs 24, 29) .......................................................................... 2

-. Aedeagal shaft without posterior process near base (Figs 32, 37, 42); footlike apical process of style with apex short and robust, about one sixth length of style (Figs 34, 39, 44)........................................................................................ 4

2. Pygofer longer than wide, with apical half distinctly narrowed, triangular or attenuated apically in lateral view (Figs 21, 26) ........................................................................................................................................................................... 3

-. Pygofer nearly circular in lateral view ......................................................................................... T. apicalis Li & Wang

3. Pygofer triangular in lateral view, dorsal margin with a row of long spine-like macrosetae (Fig. 21) .......................... ........................................................................................................................................................ T. bannaensis sp. n.

-. Pygofer attenuated apically in lateral view, apex with short but thick macrosetae (Fig. 26) .... T. fasciatus Li & Wang

4. Pygofer nearly quadrangular or very slightly narrowed apically, with apex truncate in lateral view (Figs 31, 36)..... 5

-. Pygofer distinctly narrowed apically with apex rounded in lateral view (Fig. 41) ...................................................... 6

5. Pygofer broad at base, slightly narrowed posteriorly with apex somewhat truncate in lateral view (Fig. 31); aedeagal shaft with posterior margin concave and with apex very long and slender in lateral view, extending distinctly beyond dorsal area of lamellate lateral process of aedeagus (Fig. 32) ............................... T. flavifrons (Matsumura) comb. n.

-. Pygofer nearly quadrangular in lateral view (Fig. 36); aedeagal shaft with posterior margin not concave and with apex short in lateral view (Figs 37–38) ...................................................................................... T. quadragulatus sp. n.

6. Apex of aedeagus well developed, about half length of aedeagal shaft, with two spinelike processes on dorsal margin and one spinelike process on ventral margin ......................................................................... T. albivittatus Li & Wang

-. Apex of aedeagus relatively short, about one fifth of aedeagal shaft, without processes (Figs 42– 43)........................ ....................................................................................................................................................... T. luchunensis sp. n.