Key to species (males) of Neurigona from Chinese mainland

(modified from Wang et al. 2007)

1 Abdominal segment 5 with ventral projection ............................................................................................................ 2

- Abdominal segment 5 without ventral projection ..................................................................................................... 13

2 Abdomen metallic green except basal part yellow ...................................................................................................... 3

- Abdomen mainly yellow with black spot(s) ................................................................................................................ 4

3 Abdomen metallic green, tergum 1 with yellow basal margin; all legs yellow .............................................. N. grisea

- Abdominal segments 1–3 yellow; legs chiefly yellow with coxa II brownish, from femur III to tarsus III brown to black ..................................................................................................................................................................... N. xui

4 Mesonotum entirely yellow ........................................................................................................................................ 5

- Mesonotum with large or small mid-posterior area brown or black.......................................................................... 12

5 Tarsomere I 4 with basal half swollen .......................................................................................................................... 6

- Tarsomere I 4 not swollen.............................................................................................................................................. 7

6 Arista dorsal; 5 dc bristles, 11–12 paired acr bristles; dorsal lobe of surstylus with apical incision ..... N. xiangshana

- Arista apical; 8 dc bristles, 17–18 paired acr bristles; dorsal lobe of surstylus without apical incision ........................ .............................................................................................................................................................. N. guizhouensis

7 Tarsomere I 1 shorter than or as long as tibia I............................................................................................................... 8

- Tarsomere I 1 distinctly longer than tibia I.................................................................................................................. 11

8 Scutellum with small brownish basal spot; tarsomere I 1 as long as tibia I .................................................... N. basalis

- Scutellum without brownish basal spot; tarsomere I 1 shorter than tibia I .................................................................... 9

9 Coxa I with 6–7 black anterior apical bristles; dorsal lobe of surstylus with short and obtuse process at dorsal corner ............................................................................................................................................................... N. shaanxiensis

- Coxa I with 4–6 yellow apical bristles; surstylus not as above .................................................................................. 10

10 Coxa II with black pubescence and bristles; dorsal lobe of surstylus with long and thin process at dorsal corner ...... ....................................................................................................................................................................... N. henana

- Coxa II with yellow pubescence and bristles; dorsal lobe of surstylus without process at dorsal corner .......... N. wui

11 Six dc bristles, 18–19 paired acr bristles; dorsal lobe of surstylus short and wide ................................ N. xizangensis

- Three dc bristles, acr bristles absent; dorsal lobe of surstylus with wide base and long obtuse apex ... N. jiangsuensis

12 Mesonotum with narrow mid-posterior brown spot; both tibia II and tarsus II with row of short erect pale av bristles; cercus with long apical process............................................................................................................. N. zhejiangensis

- Mesonotum with wide black mid-posterior area; tibia II or tarsus II without row of av bristle; cercus without long apical process ...................................................................................................................................... N. guangxiensis

13 Coxa I with black apical bristles................................................................................................................................ 14

- Coxa I with yellow apical bristles.............................................................................................................................. 19

14 Tarsomere I 1 shorter than tibia I................................................................................................................................. 15

- Tarsomere I 1 longer than tibia I................................................................................................................................... 18

15 More than 10 paired acr bristles ................................................................................................................................ 16

- Four paired acr bristles ................................................................................................................................ N. yunnana

16 Seventeen to eighteen paired acr bristles .......................................................................................... N. concaviuscula

- Eleven to twelve paired acr bristles .......................................................................................................................... 17

17 Tarsomere I 4 with basal half swollen and apical half concave ventrally, tarsomere I 5 with basal 1/4 swollen and middle portion concave ventrally........................................................................................................ N. sichuana sp. nov.

- Tarsomere I 4-5 normal, without swollen or concave portion ......................................................... N. hainana sp. nov.

18 Femur I without row of av bristles; tibiae II–III wholly yellow; epandrium with 2 long and wide lateral processes; ventral lobe of surstylus straight and broad, apically with 4 strong hairs....................................... N. guangdongensis

- Femur I with row of short av bristles; tibiae II–III each with black apex; epandrium with 2 slender lateral processes; ventral lobe of surstylus curved and slender, apically with 1 thick hair ................................................. N. bimaculata

19 Femur I with row of yellow av bristles ............................................................................................. N. shennongjiana

- Femur I without row of yellow av bristles ................................................................................................................. 20

20 Mesonotum with black mid-posterior or lateral spot(s).............................................................................................. 21

- Mesonotum entirely yellow ........................................................................................................................................ 23

21 Tarsomere I 5 slightly thickened, with long and strong bristles ................................................................................... 22

- Tarsomere I 5 not thickened, without long and strong bristles ...................................................................... N. centralis

22 Pleuron chiefly yellow; fore claw distinctly elongated, spine-like.......................................................... N. micropyga

- Pleuron chiefly black; fore claw normal ............................................................................................... N. yaoi sp. nov.

23 Tarsomere I 1 as long as tibia I, tarsomere II 1 longer than tibia II............................................................ N. qingchengshana

- Tarsomere I 1 shorter than tibia I, tarsomere II 1 shorter than tibia II............................................................................. 24

24 Tibia I with 1 ad bristle and 1 pd bristle; tarsomere III 1 with about 15 dense short erect spine-like black v bristles at base; wing with anterior apical corner brownish; dorsal lobe of surstylus with apical incision ....... N. xiaolongmensis

- Tibia I without ad or pd bristle; tarsomere III 1 without black v bristle at base; wing wholly hyaline; dorsal lobe of surstylus without apical incision .................................................................................................................. N. ventralis