I don't know what they were but I was stung five times yesterday on a property. I was just making my perimeter pass with the mower and wham I was hit. I hurried as fast as I could to get out of there and when I looked back all I saw was a huge swarm coming out of the ground. I was hit 2 times in the tempo, and 3 times in the elbow area. The ones in my tempo hurt really bad and swelled up a little bit. The pain didn't go away until almost 12 hours later. The ones in the elbow area the pain went away after a couple of hours, but today my arm is swelled up big time. If it gets any bigger I am going to the doctor tomorrow.