Rhyncocheilus, Fauvel, 1882

Tang, Liang, Schillhammer, Harald & Zhao, Xin, 2021, Notes on the genus Rhyncocheilus in China (Coleoptera, Staphylinidae Staphylininae) with descriptions of three new species, Zootaxa 4948 (1), pp. 99-112 : 111-112

Key to Chinese species of Rhyncocheilus

1 Elytra without patch of white pubescence; abdominal tergites III–VII with pair of oblique accessory lines; head shorter, with HW/HLŻ1.10........................................................................................ 2

- Elytra with patch of white pubescence; abdominal tergites III–VII without pair of oblique accessory lines; head longer, with HW/HLž1.04........................................................................................ 4

2 Antennomeres 1 and 2 reddish. Habitus: fig 1 in Schillhammer, 2012; aedeagus: figs 23a–c in Schillhammer, 2012. China (Yunnan)......................................................................................... R. aureus

- Antennomeres 1–7 reddish.............................................................................. 3

3 Robust body form as in Figs 1, 2 ; forebody with greater number of black markings; abdominal segments III– V with more ex- tensive white pubescence; abdominal tergite VII with patch of white pubescence longer. Aedeagus : Figs 30–33 . China (Fujian, Guangdong, Yunnan), Myanmar.............................................................. R. rugulipennis

- Slender body form as in Figs 3, 4 ; forebody with fewer black markings; abdominal segments III–V with less white pubescence; abdominal tergite VII with patch of white pubescence shorter. Aedeagus: Figs 34–37...................... R . huanghaoi

4 Vertex of head with sharp V-shaped incision (fig. 22 in Schillhammer, 2012) in front of indistinctly carinate gibbosity; abdomi- nal tergite VII without patch of white pubescence. Habitus: Figs 5, 6 ; aedeagus: Figs 38–41 . China (Henan, Hubei, Gansu)............................................................................................ R. henanensis

- Vertex of head without sharp V-shaped incision in front of indistinctly carinate gibbosity; abdominal tergite VII with large patch of white pubescence................................................................................... 5

5 Body blackish, ventral side of head mainly black. Habitus: Figs 11, 12 ; aedeagus: Figs 54–57 . China (Yunnan).................................................................................................. R. yangxiaodongi

- Body brownish, ventral side of head reddish ( Fig. 8 )......................................................... 5

6 Labrum with more setae ( Fig. 27 ); silvery pubescent patches on elytra and abdominal tergite VII larger. Habitus: Figs 9, 10 ; aedeagus: Figs 50–53 . China (Sichuan).… R. gonggashanus

- Labrum with less setae ( Fig. 24 ); silvery pubescent patches on elytra and abdominal tergite VII smaller ( Fig. 7 ).......... 7

7 Body color darker; anterior portion of mesoventrite broad, lateral margins of mesoventral process more or less straight (fig. 31 in Schillhammer, 2012). Habitus: Figs 7, 8 ; aedeagus: Figs 42–49 . China (Sichuan).................... R. griseosericans

- Body color lighter; anterior portion of mesoventrite narrower, lateral margins of mesoventral process slightly convex (fig. 32 in Schillhammer, 2012). Habitus: fig. 10 in Schillhammer, 2012; aedeagus: figs 30a–c in Schillhammer, 2012. China (Sichuan)...................................................................................... R. sommersgutteri

Figures

FIGURES 1–6. Habitus. 1, 2—Rhyncocheilus rugulipennis; 3, 4—R. huanghaoi; 5, 6—R. henanensis. Scale bars: 2 mm.

FIGURES 30–37. Aedeagal characters. 30–33—Rhyncocheilus rugulipennis; 34–37—R. huanghaoi; 30, 34—aedeagus in lateral view; 31, 35—aedeagus in ventral view; 32, 36—apical portion of aedeagal median lobe in ventrolateral view; 33, 37—inner side of apical parameral portion. Scale bars: 0.5 mm.

FIGURES 38–45. Aedeagal characters. 38–41—Rhyncocheilus henanensis; 42–45—R. griseosericans from Erlangshan; 38, 42—aedeagus in lateral view; 39, 43—aedeagus in ventral view; 40, 44—apical portion of aedeagal median lobe in ventrolateral view; 41, 45—inner side of apical parameral portion. Scale bars: 0.5 mm.

FIGURES 7–12. Habitus. 7, 8—Rhyncocheilus griseosericans; 9, 10—R. gonggashanus; 11, 12—R. yangxiaodongi. Scale bars: 2 mm.

FIGURES 54–57. Aedeagal characters of Rhyncocheilus yangxiaodongi. 54—aedeagus in lateral view; 55—aedeagus in ventral view; 56—apical potion of aedeagal median lobe in ventrolateral view; 57—inner side of apical parameral potion. Scale bars: 0.5 mm.

FIGURES 22–29. 22–24—Rhyncocheilus griseosericans; 25–27—R. gonggashanus; 28, 29—R. yangxiaodongi; 22, 25, 28— male head; 23, 26—female head; 24, 27, 29—Labrum. Scale bars: 1 mm.

FIGURES 46–53. Aedeagal characters. 46–49—Rhyncocheilus griseosericans from Emeishan; 50–53—R. gonggashanus; 46, 50—aedeagus in lateral view; 47, 51—aedeagus in ventral view; 48, 52—apical portion of aedeagal median lobe in ventrolateral view; 49, 53—inner side of apical parameral portion. Scale bars: 0.5 mm.