One of the most unusual insects found in soybean during late July and August has been the robber fly. Adult robber flies are noted for their voracious attacks on other insects, including wasps and bees. This behavior has earned them the name "bee catchers." They are usually found in open and sunny areas ranging from soybean fields to pastures to city yards and woodland edges. They fly mainly during the hotter parts of the day. Often they wait in open sunlit areas where they can command a good view of passing insects and then fly out to catch their prey.
Iowa State University
Rice, Marlin E., "The robber fly in soybean is not a wasp" (2002). Integrated Crop Management News. 1803.
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