Key to tribes of Ephydrinae Zetterstedt from the Saudi Arabia

1. Medial facial area and lower facial margin without setae; facial setae inserted in more or less vertical series, parallel with parafacial. Subcranial cavity small to large..................................................................... 2

- Medial facial area and lower facial margin setose, the latter often with long setae; insertions of facial series of setae convergent above. Subcranial cavity large and cavernous............................................................... 3

2. Presutural or sutural dorsocentral seta inconspicuous or absent...... Dagini Mathis ( Brachydeutera longipes Hendel, 1913)

- Presutural or sutural dorsocentral seta present, conspicuous............... Parydrini Wirth & Stone (genus Parydra Loew)

3. Postsutural dorsocentral setae 3–4, anterior 3 pairs sometimes very short and weak. Disc of proepisternum with few to many fine setulae............................................ Ephydrini Zetterstedt ( Ephydra flavipes (Macquart, 1843))

- Postsutural dorsocentral setae 2, both equally strong. Disc of proepisternum usually bare, sometimes with a few fine setulae............................................................ Scatellini Wirth & Stone (genus Scatophila Becker)