Key to bamboo-feeding species of Scaphoideus (male)

1. Body with broad longitudinal pale yellowish white stripes in dorsal view (Fig. 35)...................... S. kumamotonis

- Body without pale longitudinal stripes in dorsal view (Figs 1, 12, 23, 45, 55, 65)................................... 2

2. Anteclypeus and lorum brown (Figs 5, 49).................................................................. 3

- Anteclypeus and lorum yellowish white (Figs 16, 27, 59, 69)................................................... 4

3. Dorsal connective developed in lateral view (Fig. 53); apex of aedeagus with two processes laterally (Fig. 54)...................................................................................................... S. nigrigenatus

- Dorsal connective normal; apex of aedeagus without process laterally (Fig. 11)......................... S. conicaplateus

4. Baso-ventral margin of anal segment with hooklike processes (Fig. 17); subgenital plate with distal part abruptly narrowed (Fig. 19).................................................................................. S. fanjingensis

- Baso-ventral margin of anal segment without process; subgenital plate with distal part gradually narrowed (Figs 29, 61, 72)...................................................................................................... 5

5. Apex of aedeagus with stout teeth laterally in ventral view (Fig. 76); apex of paraphyses auriculate (Fig. 73).................................................................................................. S. yaanensis sp. nov.

- Apex of aedeagus without teeth (Figs 34, 64); apex of paraphyses tapering apically (Figs 31, 62).......................6

6. Ventral margin of pygofer smoothly rounded (Fig. 28); aedeagus in lateral view nearly V-shaped (Fig. 32); paraphyses with apex straight, outer margin expanded near midlength in ventral view (Fig. 31).............................. S. festivus

- Ventral margin of pygofer nearly straight (Fig. 60); aedeagus in lateral view nearly Y-shaped (Fig. 63); paraphyses with apex curved laterad, outer margin not expanded in ventral view (Fig. 62)................................... S. nigrivalveus