These are two of many shots I have of this fly - I can provide other views if they would help with an id. I found it in a small patch of asters, along with bees, drone flies, bristle flies, globetails, and others, perhaps 15 species in total. Many were familiar or I at least had a hint of where to start looking but I'm coming up blank with this one. Is it possible that it's a bee fly? Can anyone point me in a likely direction? Many thanks.