Stenus cirrus

Liu, Sheng-Nan & Tang, Liang, 2017, Seven new species of the Stenus cirrus group (Coleoptera, Staphylinidae) from Guangxi, South China, Zootaxa 4268 (2), pp. 238-254 : 250-251

Key to species of the Stenus cirrus group of Guangxi

1 Elytra without spots....................................................................................2

- Elytra with spots..................................................................................... 3

2 Head distinctly narrower than elytra; punctation of forebody mostly well delimited; longitudinal furrow of pronotum indistinct. Habitus: Figs. 7–8 ; sexual characters: Figs. 41–48......................................... S. damingshanus sp. n.

- Head wider than elytra; punctation of forebody confluent; longitudinal furrow of pronotum very long and deep. Habitus: Figs. 13–14 ; sexual characters: Figs. 59–66 ...................................................... S. hechiensis sp. n.

3 Head narrower than elytra. Aedeagus: Fig. 3 in Puthz, 1998; BL: 3.5–4.7 mm. China: Guangxi, Zhejiang ......................................................................................... S. guangxiensis Rougemont, 1984

- Head distinctly wider than elytra........................................................................ 4

4 Elytra much shorter than width, EL/EW=0.72–0.78. Habitus: Figs 5, 6 ; sexual characters: Figs. 31–40 . BL: 3.5–3.9 mm .................................................................... S. zhangdinghengi Pan Tang, Zhao & Li, 2012

- Elytra at most slightly shorter than width, EL/EW=0.84–1.07................................................. 5

5 Elytral spot longer, extending towards shoulder............................................................ 6

- Elytral spot shorter, not extending towards shoulder......................................................... 8

6 Smaller species, BL= 3.5–4.7 mm and FL=2.0 mm. Habitus: Figs.7–8 ; sexual characters: Figs 41–49. BL: 4.3 mm ........................................................................... S. maoershanus Pan Tang, Zhao & Li, 2012

- Larger species, BL= 5.3–7.9 mm and FL= 2.4–2.9 mm ....................................................... 7

7 Larger species, FL= 2.9 mm; Punctation of frons sparse; median longitudinal pronotal furrow narrow and shallow. Habitus: Figs. 11–12 ; sexual characters: Figs. 54–58 .............................................. S. lianhuashanus sp. n.

- Smaller species, FL= 2.4–2.8 mm; Punctation of frons dense; median longitudinal pronotal furrow wide and deep. Habitus: Figs. 1–2 ; sexual characters: Figs. 15–22 .................................................... S. hujiayaoi sp. n.

8 HW/EW=1.09–1.20.................................................................................. 9

- HW/EW=1.01–1.07................................................................................. .. 10

9 Larger species, BL= 3.6–5.2 mm, FL= 1.8–2.2 mm; head without distinct impunctate midline. Habitus: Figs. 3–4 ; sexual char- acters: Figs. 23–32 ........................................................................ S. bullatus sp. n.

- Smaller species, BL= 3.3 mm, FL= 1.6 mm; head with broad impunctate midline. Habitus: Figs. 9–10 ; sexual characters: Figs. 49–53 ............................................................................... S. jinxiuensis sp. n.

10 Larger species, BL= 4.3–5.2 mm; aedeagus without expulsion clasps. Habitus: Figs. 5–6 ; sexual characters: Figs. 33–40 .............................................................................................. S. exesus sp. n.

- Smaller species, BL=3.0– 3.5 mm; aedeagus with expulsion clasps (as in Fig. 1 in Puthz, 1983); female unknown. China: Guangxi ....................................................................... S. splendidulus Puthz, 1983

Figures

FIGURES 7 – 8. Dorsal habitus of Stenus damingshanus sp. n. Scale bars: 1 mm.

FIGURES 13 – 14. Dorsal habitus of Stenus hechiensis sp. n. Scale bars: 1 mm.

FIGURES 59 – 66. Diagnostic features of Stenus hechiensis. 59. Male sternite VIII. 60. Male tergites IX – X. 61. Male sternite IX. 62 – 63. Aedeagus, in dorsal view. 64. Female sternite VIII. 65. Female tergites IX – X. 66. Valvifers. Scale bars: 0.25 mm.

FIGURES 3 – 4. Dorsal habitus of Stenus bullatus sp. n. Scale bars: 1 mm.

FIGURES 5 – 6. Dorsal habitus of Stenus exesus sp. n. Scale bars: 1 mm.

FIGURES 23 – 32. Diagnostic features of Stenus bullatus. 23. Male sternite VIII. 24 Male tergites IX – X. 25 – 26. Male sternite IX. 27 – 29. Aedeagus, in dorsal view. 30. Female sternite. VIII. 31. Female tergites IX – X. 32. Valvifers and spermatheca. Scale bars: 0.25 mm.

FIGURES 33 – 40. Diagnostic features of Stenus exesus. 33. Male sternite VIII. 34. Male tergites IX – X. 35. Male sternite IX. 36 – 37. Aedeagus, in dorsal view. 38. Female sternite VIII. 39. Valvifers and spermatheca. 40. Female tergites IX – X. Scale bars: 0.25 mm.

FIGURES 11 – 12. Dorsal habitus of Stenus lianhuashanus sp. n. Scale bars: 1 mm.

FIGURES 54 – 58. Diagnostic features of Stenus lianhuashanus. 54. Male sternite VIII. 55. Male tergites IX – X. 56. Male sternite IX. 57 – 58. Aedeagus, in dorsal view. Scale bars: 0.25 mm.

FIGURES 1 – 2. Dorsal habitus of Stenus hujiayaoi sp. n. Scale bars: 1 mm.

FIGURES 15 – 22. Diagnostic features of Stenus hujiayaoi. 15. Male sternite VIII. 16. Male tergites IX – X. 17. Male sternite IX. 18 – 19. Aedeagus, in dorsal view. 20. Female sternite VIII. 21. Valvifers. 22. Female tergites IX – X. Scale bars: 0.25 mm.

FIGURES 9 – 10. Dorsal habitus of Stenus jinxiuensis sp. n. Scale bars: 1 mm.

FIGURES 49 – 53. Diagnostic features of Stenus jinxiuensis. 49. Male sternite VIII. 50. Male tergites IX – X. 51. Male sternite IX. 52 – 53. Aedeagus, in dorsal view. Scale bars: 0.25 mm.