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Driven out of said woods today by BIG swarm of whatever Drosophilidae these are. I wonder if the fact that DEET does not dissuade them does indicate they are using humans and their dogs as swarm markers, rather than food sources, as John Carr suggested earlier. Despite a heavy dose of DEET today, the swarm was bigger than ever. They do not land, but that may simple reflect the fact that they are not interested in landing.