There were 3 or 4 of these on my catmint/catnip today. Never seen anything like them because they appeared to have 3 reddish abdomens all moving constantly, as were the wasp/hornet/whatever critters. They moved very quickly from flower to flower and were hard to photograph, so hope the images are clear enough. Unfortunately you can't see the multiple abdomens, which was the really weird thing about them. From the top the wing placement looked almost like a horsefly but the wings are black and narrower. The body is actually orange and about 3/4 inch long.