Seven new species of the Stenus cirrus group (Coleoptera, Staphylinidae) from Sichuan, Southwest China Author Tang, Liang Author Liu, Sheng-Nan Author Dong, Xin-Yu text Zootaxa 2018 4425 3 527 540 journal article 29987 10.11646/zootaxa.4425.3.6 f1ba7d62-d6eb-4d7a-92dc-6896b5b06913 1175-5326 1270419 95B002AE-E58E-42A3-BD5A-47A4A6BE9AB9 Key to species of the Stenus cirrus group of Sichuan 1 Hind legs with tarsomeres IV simple...................................................................... 2 - Hind legs with tarsomeres IV distinctly bilobed.............................................................. 3 2 Abdominal tergites without reticulation. BL= 2.6–2.8 mm , FB= 1.3 mm . Aedeagus: Fig. 5 in Puthz, 2012 ................................................................................................. S. beckeri L. Benick, 1941 - Last abdominal tergites reticulated. BL= 2.3–2.8 mm , FB= 1.2–1.3 mm . Aedeagus: Fig. 6 in Puthz, 2012 ............................................................................................... S. erlangmontium Puthz, 2012 3 Abdominal segments III and IV with paratergites............................................................ 4 - Abdominal segments III and IV without paratergites.......................................................... 5 4 Abdominal segments V and VI with paratergites. BL: 4.1–4.3 mm , FL: 2.0 mm. Habitus: Fig. 3; sexual characters: Figs. 22–27........................................................................................ S . lineatus sp. n. - Abdominal segments V and VI without paratergites. BL: 4.2–4.6 mm , FL: 1.9–2.3 mm . Habitus: Fig. 7; sexual characters: Figs. 44–49.......................................................................... S . brevilineatus sp. n. 5 Elytra stout with EL/EW=0.75–0.76; pronotum bicolor with lateral portions distinctly lighter. BL: 4.1–4.5 mm , FL: 1.8–1.9 mm . Habitus: Fig. 6; sexual characters: Figs. 40–43.......................................... S . xichangensis sp. n. - Elytra slender with EL/EW≥0.85; pronotum unicolor......................................................... 6 6 Head distinctly narrower than elytra, macropterous. BL= 3.3–4.5 mm , FL: 1.9–2.1 mm . Aedeagus: Fig. 4 in Puthz, 1998 .................................................................................... S. aeneonitens Puthz, 1998 - Head distinctly wider than elytra, brachypterous............................................................. 7 7 Smaller species, BL= 3.2–3.3 mm , FL= 1.5 mm ; head black and rest parts reddish brown. Habitus: Fig. 5; sexual characters: Figs. 34–39......................................................................... S . jiudingshanus sp. n. - Larger species, BL≥ 3.7mm , FL≥ 1.8 mm ; body with different coloration.......................................... 8 8 Elytra with distinct spots, disk relatively even, punctation distinctly wider than apical cross section of antennal segment II. BL: 3.7–4.9 mm , FL: 1.8–2.1 mm . Habitus: Fig. 4; sexual characters: Figs. 28–33....................... S . emeishanus sp. n. - Elytra with indistinct spots or without spots, disk uneven, punctation as wide as apical cross section of antennal segment II....................................................................................................... 9 9 Larger species; elytra broader than long. BL: 4.6–5.2 mm , FL: 2.0– 2.3 mm . Habitus: Fig. 1; sexual characters: Figs. 8–15....................................................................................... S . cariniventris sp. n. - Smaller species; elytra at least as long as wide. BL: 4.0– 4.1 mm , FL: 1.9–2.0 mm. Fig. 2; sexual characters: Figs. 16–21........................................................................................... S . jiangrixini sp. n.