I found this in my back yard this morning while I was out catching flies for my little yellow frog. At first, I thought it was a yellow jacket, but on closer inspection, I realized it was actually a fly. Since I had my net, I caught it and put it in a jar so I could see it better and take some pictures.
It had very wasp-like pattern and coloring on its back.
But the face of a fly, and a fly's little antennas.
In this view, it was rubbing its front legs together, fly-style.
Here you can see the fly's tongue. Ok, so it's definitely a fly. I had never seen one like this before, so I looked it up online (BugGuide.net) It's a wasp-mimic fly of the Spilomyia species.