The dramatic black and yellow coloration wards off would-be predators. Upon closer examination, one can see there is no stinger at the tip of the abdomen. The Flower Fly may 'hover' in flight, like wasps, and that behavior led to them being called Hover Flies in Europe. They are common in the central and western regions of North America. They can also be found in Africa.
This particular species' larvae feeds on aphids, tiny insects that eat plant juices. Because of that diet, Flower Flies help keep aphid populations down so plants and flowers suffer less.