Key to genera of Hecamedini from the Saudi Arabia

1. Scutellum bearing 3 marginal setae; postgenal margin sharp; gena high, over 1/2 eye height............ Hecamede Haliday

- Scutellum bearing 2 marginal setae; postgenal margin rounded; gena short, less than 1/2 eye height....................2.

2. Palpus mostly yellow; prescutellar acrostichal setae greatly reduced or absent; 1 katepisternal seta; face with 1 large lateral seta............................................................ Eremotrichoma perspiciendum (Becker, 1903)

- Palpus blackish; 1 pair of prescutellar acrostichal setae, well developed; 2 katepisternal setae, the 2nd seta smaller and inserted below larger seta; face with 2 or more large lateral setae....................................... Allotrichoma Becker