The Hover Fly is one of those beneficial insects you should encourage in your garden when you find them. The adults eat nectar and pollinate and the grubs eat aphids and othe soft bodied insects aplenty. Hover Flies have amazing flying skills. Whatever a lightening quick jet might do they can, whatever a helicopter might do they can do that too, forwards, backwards, sideways, or still, they are amazing to watch. Toxomerus marginatus is the most common of the Hover Flies. There are around 150 species in the group. The wide abdomen means this one is a female. This is the average coloring for the species.