Schizodactylus Brulle 1835

Key to known extant species of Schizodactylus

1. Wings fully developed.................................................................................. 2

- Wings very short, reaching only half of abdomen or less.............................. S. inexspectatus (Werner, 1901)

2. Pronotum normal, in middle longer than 3 mm.............................................................. 3

- Pronotum very short, in middle long 2.2 mm.......................................... S. brevinotus Ingrisch, 2002

3. Apex of male subgenital plate with projection............................................................... 4

- Apex of male subgenital plate without projection, triangular excision in middle.................................... 6

4. Subgenital plate broader than long, the projection forming a paired of lobes....................................... 5

- Subgenital plater longer than broad, The projection formed as a rounded lobe with flat top....... S. burmanus Uvarov, 1935

5. Projection rounded and protruding forward in lateral view; first and second internal apical spurs similar in shape......................................................................................... S. tuberculatus Ander, 1938

- Projection flat, broader than long and protruding downward in lateral view; first and second internal apical spurs different.................................................................................... S. salweenensis sp. nov.

6. Compound eyes normal, size medium; body length more than 27 mm in male...................................... 7

- Compound eyes relatively large (comprising 3/4 of side length of head), size small; body length 23–25 mm in male............................................................................................ S. minor Ander, 1938

7. Size large in body length more than 42mm in male, 47mm in female, the first internal apical spur of posttibia acute apically; male titillators slender; female subgenital plate with hind margin rounded in the middle.......... S. monstrosus Drury, 1770

- Size medium in body length 27mm in male; 29mm in female; first internal apical spur of posttibia less acute apically; Male titillators robust; female subgenital plate with hind margin straight in the middle.............. S. hesperus Bey-Bienko, 1967