#3
Most likely
Rhyncomyia nigripes but
desertica cannot be ruled out based on just this image.
Setyaningrum, H., & H.M. Al Dhafer, 2014. The Calliphoridae the blow flies (Diptera: Oestroidea) of Kingdom of Saudi Arabia. -
Egyptian Academic Journal of Biological Sciences, A. Entomology 7(1): 49-139. (
PDF)