What is going on here?
This creature landed on my window long enough for me to take the picture and then flew off for parts unknown. What captured the wasp? I overexposed the print for more detail.
Fort Worth, Texas
We do not have the necessary skills to count wing veins nor antennae segments to exactly identify the insects in your photo, and the angle is an unusual one for comparison to usual photographs. We would wager this is a Robber Fly, but are not confident enough to take the ID any further. We will try to contact Eric Eaton to get his opinion on both the fly and wasp.
The fly is a robber fly in the genus Mallophora. The victim is a paper wasp in the genus Polistes.