Key to the Species of genus Saigona

1 Vertex with cephalic process short, shorter than pronotum and mesonotum combined (Figs. 4–6, 11, 12, 26, 36, 46, 76) ................................................................................ 2

- Vertex with cephalic process long, longer than or nearly as long as pronotum and mesonotum combined (Figs. 1–3, 7–10, 13, 16, 56, 66) .............................................. 5

2 Postclypeus yellowish or yellowish brown (Figs. 48, 78); mesonotum with a yellowish stripe along median longitudinal carina (Figs. 46, 76) ................................................. 3

- Postclypeus fuscous (Figs. 28, 38); mesonotum without a yellowish stripe along median longitudinal carina (Figs. 26, 36) .................................................................... 4

3 Mesonotum with median longitudinal yellowish stripe narrower (Figs. 11, 12, 76); aedeagus with phallobase with apical ventral membranous lobe with numerous, fine spines at apex (Figs. 83, 84) .................................................... S. ussuriensis (Lethierry)

- Mesonotum with median longitudinal yellowish stripe much broader (Figs. 6, 46); aedeagus with phallobase with apical dorsal and ventral membranous lobes with numerous, fine spines at apex (Figs. 53, 54).............................. S. latifasciata sp. nov.

4 Frons with lateral carinae reaching to frontoclypeal suture (Fig. 38); aedeagus with phallobasal conjunctival processes relatively short, spiraled dorsally (Figs. 43–45) .... ...................................................................................................... S. henanensis sp. nov.

- Frons with lateral carinae reaching to eyes, not to frontoclypeal suture (Fig. 28); aedeagus with phallobasal conjunctival processes long, not spiraled dorsally (Figs. 33–35) ................................................................................................ S. fuscoclypeata sp. nov.

5 Cephalic process bulbous apically, with 3 pairs of symmetrical knoblike protuberance

on lateral regions (Figs. 16, 17); pygofer with one distinct process on posterior margin (Fig. 20)..................................................................................... S. fulgoroides (Walker) - Cephalic process not bulbous apically, without knoblike protuberance on lateral regions (Figs. 13, 56, 66); pygofer without a distinct process on posterior margin (Figs. 60, 70) ................................................................................................................ 6

6 Vertex with yellowish spot at apex (Fig. 13); frons with lateral carinae reaching to frontoclypeal suture (Fig. 15) ........................................................ S. capitata (Distant)

- Vertex without yellowish spot at apex; frons with lateral carinae reaching to eyes, not to frontoclypeal suture.................................................................................................. 7

7 General color much darker; mesonotum with yellowish stripe along median longitudinal carina very narrow ............................................................ S. taiwanella Matsumura

- General color much paler; mesonotum with yellowish stripe along median longitudinal carina broad ........................................................................................................... 8

8 Cephalic process distinctly robust (Figs. 7, 8, 56); aedeagus with phallobase with apical ventral membranous lobe with numerous, fine spines at apex (Fig. 64) .................. ........................................................................................................... S. robusta sp. nov.

- Cephalic process relatively slender (Figs. 9, 10, 66); aedeagus with phallobase with apical dorsal and ventral membranous lobes with numerous, fine spines at apex (Fig. 74) .................................................................................................... S. sinicola sp. nov.