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