http://www.ispotnature.org/node/434604
- is an iSpot post of an "unknown wasp" carrying the leg of an Opilione. I'm pretty sure the "wasp" is an ant because of its right-angled antennae and general body shape, but I can't find any account of hunting behaviour in alate ants. I assume it would be a male as all accounts seem to say the females lose their wings after the nuptial flight. Equipping male ants with jaws and digestive systems seems a bit like over-engineering...
Neither male nor winged female ants hunt and male ants can not feed themselves. I notice that your "unknown wasp" has now been identified on iSpot as a sawfly.