I'm late to this forum and to this topic. (by about 12yrs). However in my quest to find if there are similar experiences to mine, I found this post and joined the site! Dragonfly's swarm by the hundreds on my property from mid-summer into the fall. What variety is not known to me other than they're the size of sparrows and wiped out my hive. I'm surrounded by water and have two swamps on my land, which are breeding grounds for all types of pests including black flies and mosquitos, so I welcome the arrival of our aerial assault force. I've posted signs about not eating the bees but they haven't clued in yet. (300 million years and they still can't follow a simple request)