About 9 AM I heard the sound of a swarm. There was no such activity coming out of the 12 colonies I have at this location. !5' up in a dogwood, I saw a swarm about the size of a baseball-very small for the Charlotte, NC area. Bees were flying around the bee yard & I drew them over to a swarm box banging a tire iron on a hub cap. But they then changed course and started to collect under and at the back side of two colonies that still have an extra super that was not capped when I pulled my honey. (It is now capped) These colonies are about 15' apart. I put a swarm box next to the largest group, but they did not take it. 30 minutes later, there was lots of movement back & forth between the dogwood swarm and the two groups near the establish colonies. By 10:30 the tree swarm was gone and lots of bees were trying to get into the two with extra supers. Now, at 4 PM, most of the colonies have settled down & it seems traffic is normal in & out of the hives. I looked under the two colonies of interest to see if a swarm had collected on the screen bottoms, but all is clear there. Do any of you have an idea on what was going on?