This is a big Robber Fly, asilidae, catched an orange winged ant, is possible to see the digestive enzimes it injected in victim body.
This is a big Robber, the photo is with Canon MP-E 65mm f/2.8 macro at about 1.5 magnification (or less) The flash is the 580 EX II bracket mounted.
Crop of the above shoot, it's possible to see the enzimes of the Robber turning the inner parts of ant body in liquid form, noticeable by the bubbles, feeding it almost digested.
The second shoot with the scene of asilidae digestive process, in this one is possible to see the bubles (due to digestive enzimes) inside the bug.
Crop of the Robber Fly prey it's possible to see the bubles inside the prey due to digestive enzimes.