Key to males of Chinese species of Ctenoneura

1 Hind margin of subgenital plate deeply excavated medially, stylus slender, placed on the upper left margin of the plate (Fig. 16 J)........................................................................................ C. yunnanea

- Not as above.........................................................................................2

2 Right of subgenital plate with a distinct large eds groove heading to the median of posterior, the sgs long, curved, distinctly vis- ible (Figs. 16 K–L).................................................................... C. elongata sp. nov.

- Not as above........................................................................................ 3

3 Pronotum generally unicolored, usually with lateral margins of anterior yellowish subtransparent; subgenital plate protruded towards right (Figs. 17 G, 18 G, 19 G, 20 G)................................................................ 4

- Lateral areas of pronotum transparent or subtransparent widely; subgenital plate with an incision or excavation on the left of the apex (Figs. 16 D, F, H–I)............................................................................ 5

4 Body brownish black or nearly black, supra-anal plate with a large process (Fig. 5 D)............ C. heixuanfeng sp. nov.

- Body generally light color, or at most dark brown, supra-anal plate not as above....................................8

5 Subgenital plate with an incision invisible in ventral view, visible in rear view (Figs. 16 A–D)................ C. simulans

- Subgenital plate with a clear incision or excavation in ventral view (Figs. 16 F, H–I)............................... 6

6 Subgenital plate with a deep excavation on the left (Fig. 16 H).................................. C. helicata sp. nov.

- Subgenital plate with a shallow depression on the left side of the apex (Figs. 16 F, I)............................... 7

7 Body brown, hind margin of pronotum not hyaline (Fig. 12 A).................................... C. qiuae sp. nov.

- Body rusty yellow, hind margin of pronotum hyaline (Bey-Bienko 1969).................................. C. misera

8 Cerci brownish yellow, stylus very small, weak (Figs. 7 E–F)................................... C. delicata sp. nov.

- Cerci dark brown, stylus robust or slender.................................................................. 9

9 Supra-anal plate with two small processes (Fig. 8 D)......................................... C. papillaris sp. nov.

- Supra-anal plate protruded, median transparent deeply (Fig. 6 D)............................ C. bawangensis sp. nov.