Key to species of Nazeris in Guangxi, China

1 Head with non-umbilicate punctation (Fig. 35).............................................................. 2

- Head with umbilicate punctation (Fig. 7)................................................................... 3

2 Pronotum with narrow impunctate elevation in posteriorly half (Hu & Li 2017: 337, Fig. 15); dorso-lateral apophyses of aedeagus not widened near middle in ventral view (Hu & Li 2017: 337, Fig. 18).................... N. alatus Hu & Li, 2017

- Pronotum with unconspicuous or lacking impunctate elevation in posteriorly half (Fig. 35); dorso-lateral apophyses of aedeagus widened near middle in ventral view (Fig. 38).................................... N. yanzhuqii Hu & Qiao, sp. n.

3 Body reddish brown (Fig. 17), at most 6.0 mm.............................................................. 4

- Body dark brown (Fig. 25), at least 6.1 mm ................................................................ 13

4 Head and pronotum with fine microsculpture (Figs 18, 19).............................. N. rugosus Hu & Qiao, sp. n.

- Head and pronotum lacking microsculpture................................................................. 5

5 Abdomen with fine microsculpture on all tergites........................................... N. qini Hu & Li, 2012

- Abdomen lacking microsculpture......................................................................... 6

6 Dorso-lateral apophyses of aedeagus extending to the same level as apex of the median lobe.......................... 7

- Dorso-lateral apophyses of aedeagus extending much beyond apex of median lobe.................................. 8

7 Ventral process of aedeagus narrow, constricted to sharp apex in ventral view (Hu et al. 2012: 36, Fig. 4).............................................................................................. N. dayaoensis Hu & Li, 2012

- Ventral process of aedeagus conspicuously broad, with round apex in ventral view (Assing 2016: 307, Fig. 11)........................................................................................... N. latilobatus Assing, 2016

8 Ventral process of aedeagus nearly triangular, with narrow apex in ventral view (Assing 2016: 309, Fig. 16)................................................................................................ N. obtortus Assing, 2016

- Ventral process of aedeagus broad, with wide apex in ventral view............................................... 9

9 Ventral process of aedeagus provided with a pair of apicad narrow processes on dorsal side of apex (Hu et al. 2012: 38, Fig. 12) N. luoi Hu & Li, 2012

- Ventral process of aedeagus lacking processes near apex...................................................... 10

10 Ventral process of aedeagus with small semi-circular excision at apex in ventral view (Fig. 15).................................................................................................. N. maoershanus Hu & Qiao, sp. n.

- Ventral process of aedeagus lacking excision at apex in ventral view............................................ 11

11 Ventral process of aedeagus with round apex in ventral view and with a pair of round basal laminae ventrally (Hu et al. 2013: 87, Fig. 4).................................................................. N. damingshanus Hu & Li, 2013

- Ventral process of aedeagus with truncate apex in ventral view and with a pair of thin basal laminae ventrally........... 12

12 Dorso-lateral apophyses of aedeagus roundly widened at apex in ventral view (Hu & Li 2017: 336, Fig. 13)........................................................................................... N. huapingensis Hu & Li, 2017

- Dorso-lateral apophyses of aedeagus narrowed at apex in ventral view (Hu et al. 2012: 39, Fig. 16).... N. tani Hu & Li, 2012

13 Dorso-lateral apophyses of aedeagus extending slightly beyond apex of ventral process............................. 14

- Dorso-lateral apophyses of aedeagus not reaching apex of ventral process........................................ 16

14 Dorso-lateral apophyses of aedeagus broad, distinctly widened near middle (Hu et al. 2012: 41, Fig. 28)................................................................................................ N. megalobus Hu & Li, 2012

- Dorso-lateral apophyses of aedeagus slender, not widened near middle.......................................... 15

15 Male sternite VII shallowly concaved in the middle (Fig. 26); dorso-lateral apophyses of aedeagus widened near apex in ventral view (Fig. 28)............................................................. N. yuyimingi Hu & Qiao, sp. n.

- Male sternite VII not concaved in the middle (Hu & Li 2017: 340, Fig. 26); dorso-lateral apophyses of aedeagus not widened near apex in ventral view (Hu & Li 2017: 340, Fig. 28).................................. N. chenyanae Hu & Li, 2017

16 Dorso-lateral apophysis of aedeagus greatly expanded in apical half (Hu et al. 2012: 42, Fig. 34)... N. grandis Hu & Li, 2012

- Dorso-lateral apophysis of aedeagus slender, not expanded in apical half......................................... 17

17 Ventral process of aedeagus extremely elongate, about twice as long as dorso-lateral apophysis (Hu et al. 2013: 88, Fig. 10)................................................................................ N. longilobus Hu & Li, 2013

- Ventral process of aedeagus not extremely elongate.......................................................... 18

18 Ventral process of aedeagus with round apex (Assing 2016: 307, Fig. 4)..................... N. bihamatus Assing, 2016

- Apex of ventral process of aedeagus divided into two branches in ventral view.................................... 19

19 Sternite VII with posterior margin weakly prominent at middle (Hu & Li 2017: 338, Fig. 21); ventral process of aedeagus with thin apical branches (Hu & Li 2017: 338, Figs 23, 24); dorso-lateral apophyses of aedeagus slightly curved in lateral view (Hu & Li 2017: 338, Fig. 24).............................................................. N. exilis Hu & Li, 2017

- Sternite VII with posterior margin truncate at middle (Fig. 31); ventral process of aedeagus with wide apical branches (Figs 3 3, 34); dorso-lateral apophyses of aedeagus straight in lateral view (Fig. 34).............. N. biacuminatus Hu & Qiao, sp. n.