Key to species of Krisna from China (modified from Zhang et al. 2008)

1. Ocelli placed close to adjacent eye at distance less than half diameter of ocellus.................................... 2

- Ocelli placed slightly away from adjacent eye by distance equal to or more than half diameter of ocellus................ 3

2. Crown with two anterior transverse black spots............................................ K. strigicollis (Spinola)

- Crown with four anterior transverse black spots (Fig. 3)................................. K. quadrimaculosus sp. nov.

3. Male pygofer lobe with long ventral process extended to caudal margin in addition to short pointed ventral process at middle of ventral margin (Fig. 63)........................................................... K. nigromarginata Cai & He

- Male pygofer lobe with long ventral process extended to caudal margin, without short pointed ventral process (Figs. 64–65)...................................................................................................... 4

4. Aedeagal shaft apex strongly inflated in ventral aspect (Fig. 58)................................................. 5

- Aedeagal shaft parallel-sided or tapered in ventral aspect (Figs. 51–58)........................................... 6

5. Male with ventral pygofer process spiculate in distal half (Figs. 44–45)...................... K. rufimarginata Cai & He

- Male with ventral pygofer process not spiculate in distal half (Fig. 64)......................... K. expansiva Li & Wang

6. Aedeagus with ventral margin distinctly concave in lateral aspect................................. K. sherwilli Distant

- Aedeagus with convex or straight ventral margin in lateral aspect (Figs. 46, 51, 54–55).............................. 7

7. Male pygofer ventral process with spine or projection near base (Figs. 47–48)..................................... 8

- Male pygofer ventral process without basal spine or projection (Figs. 49–50)...................................... 9

8. Male pygofer ventral process with short spine; aedeagal shaft with strongly concavely excavated dorsal margin................................................................................................... K. kirbyi (Baker)

- Male pygofer ventral process with long projection; aedeagal shaft narrowed gradually to apex, without strongly concavely excavated dorsal margin (Figs. 47–48).................................................................... 10

9. Basal projection of ventral process longer than half length of pygofer process (Fig. 49); aedeagal shaft being symmetrical at apex (Figs. 52, 57)............................................................. K. furcata Zhang, Zhang & Dai

- Basal projection of ventral process less than half length of pygofer process (Fig. 50); aedeagal shaft asymmetrical at apex (Fig. 53)................................................................................ K. viridula Li & Wang

10. Aedeagal shaft with angular process at base in lateral view (Fig. 54); ventral pygofer triangular process sinuate near apex (Fig. 48).................................................................... K. viraktamathi Zhang, Zhang & Dai

- Aedeagal shaft broadly rounded at base in lateral view, without angular process (Figs. 46, 51, 62); ventral pygofer process not sinuate near apex (Fig. 47)............................................................................. 11

11. Male pygofer lacking prominent projection on ventral margin (Fig. 47)............... K. daiyunensis Zhang, Zhang & Dai

- Male pygofer with prominent projection on ventral margin.................................................... 12

12. Aedeagal shaft robust especially near base (Fig. 55); male with hind margin of eighth sternite convex (Fig. 62).............................................................................................. K. concava Li & Wang

- Aedeagus broad-wide in lateral view (Fig. 56); male eighth sternite posterior margin broadly rounded (Fig. 61)......................................................................................... K. yingjiangensis Li & Wang