Key to species of male Fistulatus

1 Pygofer with two pairs of processes ............................................................................................................................. 2

- Pygofer with one pair of processes ............................................................................................................................... 3

2 Aedeagal shaft with pair of flangelike processes ........................................................................................... F. luteolus

- Aedeagal shaft with two pairs of slender processes ........................................................................... F. quadrispinosus

3 Aedeagal shaft with two pairs of processes ............................................................................................... F. bidentatus

- Aedeagal shaft with one pair of processes or flanges................................................................................................... 4

4 Style with an apical extension ...................................................................................................................... F. sinensis

- Style without an apical extension ................................................................................................................................. 5

5 Pygofer with processes directed medially; aedeagus with shaft relatively straight in lateral view ........... F. rectilineus

- Pygofer with processes directed ventrally; aedeagus with shaft curved dorsally in lateral view ................................. 6

6 Connective with lateral processes; style with apical process slightly curved laterally, digitate ...................... F. athena

- Connective without lateral processes; style with apical process strongly curved laterally, footlike .............................. ............................................................................................................................................................. F. monkoboensis