Stenus tuberifrons, Puthz, 2019

Puthz, Volker, 2019, Neue Stenus-Arten aus China (Coleoptera, Staphylinidae) 2 361. Beitrag zur Kenntnis der Steninen, Linzer biologische Beiträge 51 (1), pp. 203-233 : 222-223

Key to the species oI the Stenus tuberifrons group]

A= Aedeagus; FB = forebody; S = Spermatheca

1 Abdomen with paratergites .................................................................................................2

- Abdomen without paratergites but line-like margined. ♂: Unknown. ♀: S (fig. 97). 4.5- 5.3mm (FB 2.1mm). Yunnan: Haba Shan ........................................... exstantifrons nov.sp.

2 Paratergites very narrow, about as broad as antennal segment 3. ♂: Unknown. ♀: S (fig. 112). 4.6-4.1mm (FB 1.9-2.0mm). Sichuan: Jiudingshan............ exstructifrons nov.sp.

- Paratergites broader than antennal segment 3 .....................................................................3

3 Abdomen ellipsoid, paratergites broader, in horizontal position. Median portion of frons densely punctate. Larger species: 5.7-6.8mm (FB 2.9mm). ♂: Unknown. ♀: S (fig. 77). Yunnan: Diancang Shan....................................................... extumidifrons nov.sp.

- Abdomen ± strongly cylindrical, paratergites less broad, bent downwards. Smaller species: FB <2.4mm ............................................................................................................4

4 Punctation of tergite 7 denser, interstices smaller than diameter of punctures ....................5

- Punctation of tergite 7 less dense, interstices larger than diameter of punctures, at most as large as. ♂: A (fig. 92). ♀: S (fig. 98). 4.0-4.7mm (FB 2.0-2.3mm). Sichuan: Gongga Shan ........................................................................................ tuberatifrons nov.sp.

5 Tergite 7 without microsculpture ........................................................................................6

- Tergite 7 with microsculpture ...........................................................................................10

6 ♂: A (fig. 94). ♀: S (fig. 95). 4.0-6.2mm (FB 2.3-2.5mm). Yunnan: Diancang Shan, Lijiang. Sichuan: Emei Shan ............................................................ watanabeianus PUTHZ

- ♂, ♀ otherwise.....................................................................................................................7

7 ♂: A (fig. 80). ♀: S (fig. 111). 4.0-4.8mm (FB 2.0-2.1mm). Yunnan: Diancang Shan......... .......................................................................................................... convexiventris nov.sp.

- ♂: Unknown. ♀: S (fig. 109)̳4.5-5.3mm (FB 2.3mm). Yunnan: Gaoligong Shan............. ..................................................................................................................................spec. A

8 Smaller, FB 1.8mm. ♂: A (fig. 83). ♀: Unknown. 3.5-3.9mm. Sichuan: Daxue Shan.......... ............................................................................................................ expressifrons nov.sp.

- Larger, FB 2.0-2.3mm.........................................................................................................9

9 Head narrower (HW: EW 0.87). Punctation of frons slightly less dense, interstices shiny, punctation of tergite 7 slightly less dense (fig. 63). ♂: A (fig. 84). ♀: S (fig. 104). 4.2-5.2mm (FB 2.2-2.3mm). Sichuan: Mt. Luoji .......................... exsertifrons nov.sp.

- Head broader (HW: EW 0.89), punctation of frons extremely dense, interstices not shiny, punctation of tergite 7 denser (fig. 64). ♂: A (fig. 82). ♀: S (fig. 100). 4.5- 5.0mm (FB 2.0-2.2mm). Sichuan: Daxue Shan..................................... excretifrons nov.sp.

10 Pronotum and elytra dark chestnut-brown.........................................................................11

- Pronotum and elytra lighter, rust-red. ♂: A (fig. 85). ♀: S (fig. 99). 4.3-5.0mm (FB 2.2- 2.3mm). Sichuan: Meigu Xian, Ebian Xian ..................................... extuberatifrons nov.sp.

11 Median portion of frons sparsely punctate, interstices about as large as punctures; tergite 7 distinctly reticulate. ♂: A (fig. 74). ♀: S (fig. 110). 4.2-5.4mm (FB 2.2- 2.3mm). Sichuan: Emei Shan, Erlang Shan, Cangshan ............................ tuberifrons PUTHZ

- Median portion of frons denser punctate, interstices at most as large as half diameter of punctures; reticulation on tergite 7 faint. ♂: A (fig. 81). ♀: S (fig. 96). 4.2-5.4mm (FB 2.2-2.3mm). Yunnan: Diangang Shan ............................................. diancangshanus nov.sp.