Stenus cephalotes, Sharp, 1889

Tang, Liang & Jiang, Zhuo-Heng, 2018, Three new species of the Stenus cephalotes group fom Zhejiang, East China (Coleoptera, Staphylinidae), Zootaxa 4472 (2), pp. 298-306 : 305-306

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

Figures

FIGURES 1, 2. Stenus qingliangfengus. 1 habitus in dorsal view 2 habitus in ventral view. Scale bars: 1mm.

FIGURES 7–12. Stenus qingliangfengus. 7 male sternite VIII 8 male sternite IX 9, 10 aedeagus 11 female sternite VIII 12 valvifers and spermatheca. Scale bars: 0.25 mm.

FIGURES 3, 4. Stenus communicatus. 3 habitus in dorsal view 4 habitus in ventral view. Scale bars: 1mm.

FIGURES 13–18. Stenus communicatus. 13 male sternite VIII 14 male sternite IX 15, 16 aedeagus 17 female sternite VIII 18 valvifers and spermatheca. Scale bars: 0.25mm.

FIGURES 5, 6. Stenus fengyangshanus. 5 habitus in dorsal view 6 habitus in ventral view. Scale bars: 1mm.

FIGURES 19–24. Stenus fengyangshanus. 19 male sternite VIII 20 male sternite IX 19, 21, 22 aedeagus 23 female sternite VIII 24 valvifers and spermatheca. Scale bars: 0.25mm.