With wings like a fly, could they be a fly?
How long are they, are the stripes on the abdomen?
Is the abdomen narrow or broad and flat? Do they have a narrow waist or is it about the same as the whole body?
What type of eyes does it have, those of a hoverfly which are big, dull and squarish or black, shiny and elongated like a wasps?
A hoverfly which has white 'stripes' which don't meet in the middle is Scaeva pyrastri.