Key to species of Hybridolinus

1. Head and pronotum without microsculpture ................................................................................................................ 2

- Head and pronotum with distinct microsculpture......................................................................................................... 4

2. Tergites III–V entirely black, posterior half of tergite VI and entire tergite VII reddish; elytra brick-red, each with only a slight “shadow” postero-laterally; eyes smaller, 1.15 times as long as tempora ..... H. singularis Schillhammer

- Tergites III–VII with posterior margins markedly reddish; elytra brick-red, each with variably large, well delimited black marking laterally; eyes very large, 1.75–2.00 times as long as tempora............................................................. 3

3. Antennae with last three segments creamy white; underside of paramere with 18–19 sensory peg setae on each lobe (Figs. 6 H, 7B) ..................................................................................................... H. fengyangshanus Li & Zhou sp. n.

- Antennae with last two segments creamy white; underside of paramere with 13–15 sensory peg setae on each lobe .. ........................................................................................................................................ H. hesperoides Schillhammer

4. Body entirely black........................................................................................................... H. diabolicus Schillhammer

- Body not entirely black: elytra, tergites and legs at least partly reddish-testaceous, reddish-yellow or yellowish...... 5

5. Abdominal tergite VIII partly black ............................................................................................................................. 6

- Abdominal tergite VIII entirely reddish ....................................................................................................................... 7

6. Elytra reddish-testaceous, each elytron with large, triangular, postero-lateral pitchy patch .......................................... ............................................................................................................................................. H. smetanai Schillhammer

- Elytra black with shoulders, epipleura and posterior margins markedly pale yellowish ............................................... ........................................................................................................................................ H. flavocinctus Schillhammer

7. Elytra violaceous........................................................................................................................................................... 8

- Elytra reddish.............................................................................................................................................................. 11

8. Abdominal tergite VII entirely reddish ............................................................................... H. daliensis Schillhammer

- Basal third or half of abdominal tergite VII black........................................................................................................ 9

9. Femora and tibiae entirely yellow .................................................................................. H. meilishanus Schillhammer

- Femora and apices of tibiae black............................................................................................................................... 10

10. Pronotum with punctures separated by 1–2 times their diameter; paramere with angular emargination (Figs. 6 F, 7D) ................................................................................................................................. H. baoxingensis Li & Zhou sp. n.

- Pronotum with punctures separated by 2–5 times their diameter; paramere with rounded emargination (similar to Fig. 7 G) ................................................................................................................................... H. similis Schillhammer

11. Legs entirely yellow.......................................................................................................... H. jizushanus Schillhammer

- Femora and apices of tibiae dark ........................................................................................ H. decipiens Schillhammer 1. Hybridolinus baoxingensis Li & Zhou sp. n. (Figs. 1–3, 6 F, 7D–F)