this is a robberfly with a small insect he's caught and is 'eating' ..
robberflies seize their prey in flight and inject their victims with saliva containing neurotoxic and proteolytic enzymes .. this injection, inflicted by their modified mouthparts (hypotharynx), rapidly immobilizes prey and digests bodily contents .. the robberfly soon has access to a liquid meal, which is generally consumed upon returning to a perched position. gross and fascinating .. !!!