Key to species of the Stenus cephalotes group fom Zhejiang

1 Larger species, FB: 2.2mm; head distinctly narrower than elytra. Habitus and sexual characters: Figs. 2, 8– 11 in Tang, Liu & Zhao, 2017. Zhejiang (Dongbaishan)...................................... S. zhejiangensis Tang, Liu & Zhao, 2017

- Smaller species, FB: 1.1–1.7 mm; head distinctly wider than elytra.............................................. 2

2 Abdominal segment III with entire paratergites.............................................................. 3

- Abdominal segment III at most with traces of paratergites on basal half........................................... 5

3 Forebody without reticulation. Sexual characters: Figs. 1–3 in Puthz, 2003. Zhejiang (Tianmushan)... S. decens Puthz, 2003

- Forebody reticulated................................................................................... 4

4 HW/EW: 1.09–1.11; punctation of pronotum and elytra less confluent. Habitus and sexual characters: Figs. 3, 4, 13–18. Zhejiang (Jinhua)........................................................................ S. communicatus sp. n.

- HW/EW: 1.14–1.38; punctation of pronotum and elytra more confluent. Habitus and sexual characters: Figs. 1, 3– 7 in Tang, Liu & Zhao, 2017. Zhejiang (Dongbaishan)................................ S. dongbaishanus Tang, Liu & Zhao, 2017

5 Interstices of pronotum smooth; abdominal tergites and sternites seperated by sutures. Habitus and sexual characters: Figs. 5, 6, 19–24. Zhejiang (Fengyangshan).................................................... S. fengyangshanus sp. n.

- Interstices of pronotum reticulated; abdominal tergites and sternites entirely fused.................................. 6

6 Punctation of head dense with interstices on lateral portions as wide as half to entire puncture diameter; elytra longer, EL/ EW:0.93–0.98. Habitus and sexual characters: Figs. 1, 6– 10 in Tang & Puthz, 2010. Zhejiang (Jiulongshan)......................................................................................... S. substrictus Tang & Puthz, 2010

- Punctation of head dense with interstices on lateral portions distinctly narrower than to as wide as half the diameter of punctures; elytra longer, EL/EW:0.81–0.90..................................................................... 7

7 Larger species, FL: 1.4mm. Habitus and sexual characters: Figs. 1, 2, 7–12. Zhejiang (Qingliangfeng).................................................................................................... S. qingliangfengus sp. n.

- Smaller species, FL: 1.1–1.3 mm ......................................................................... 8

8 Punctation of head dense with interstices on lateral portions distinctly narrower than puncture diameter; punctation of pronotum more confluent. Habitus and sexual characters: Figs. 3, 14– 19 in Tang & Puthz, 2010. Zhejiang (Tianmushan)............................................................................ S. pseudomicuba Tang, Puthz & Yue, 2016

- Punctation of head sparse with interstices on lateral portions narrower than to as wide as half the diameter of punctures; punctation of pronotum less confluent. Habitus and sexual characters: Figs. 2, 11– 15 in Tang & Puthz, 2010. Zhejiang (Baishanzu).......................................................................... S. breviculus Tang & Puthz, 2010