My wife put out some watermellon rinds on the compost pile, and this afternoon saw a whole bunch of wasps on the rinds, eating the mellon. I googled some pictures of wasps, but couldn't find one which matches these:
(click for bigger pictures)
The common wasp pictures I saw on the internet had markings which were mostly yellow with a little black; these are mostly black with a little yellow. They come around the hive a little too (especially today when I had the hive open and was inspecting).
Anyone know what these are?