Drone Fly Eristalis nemorum
Another frequent visitor to gardens is Eristalis nemorus. It rather looks like all the other Drone Fly species, but can be identified by the black spot in the wing near the edge: it is a small black dot and not a bigger blob. This is a feature both sexes share. The other details helping you telling this species apart are much harder to see and far beyond the scope of this site. Due to the fact that many species are highly variable you need some experience in identifying the individual species. Scientifically this species is also known as Eristalis interruptus.