Key to tribes of Gymnomyzinae from the Saudi Arabia

1. Foreleg raptorial, with fore femur greatly enlarged and fore tibia ended in a large spur.............................................................................................. Ochtherini ( Ochthera schembrii Rondani, 1847)

- Foreleg normal, fore femur slender, fore tibia not ended in a large spur...........................................2.

2. Posterior margin of gena sharply angulate; gena with fine pale setulae...........................................3.

- Posterior margin of postgena meeting occiput at obtuse and broadly rounded angle; postgena usually with coarse black setulae; body shiny to dull.....................................................................................4.

3. Scutellum with 2 pairs of marginal setae; body mostly shiny black............................. Gymnomyzini, in part

- Scutellum with 3 pairs of marginal setae; body mostly dull, whitish to grayish...................... Hecamedini, in part

4. Posterior notopleural seta inserted much farther dorsad from notopleural suture than anterior seta....... Hecamedini, in part

- Anterior and posterior notopleural setae inserted equidistant from notopleural suture ....................... Discocerinini