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Spilomyia fusca
Black with white markings. Almost wasp or bee like in appearance except the antennae make me believe it is a type of hover fly.
Rural SW Pennsylvania
Beautiful fly, funny that Susan mentioned Hornet, as this is a mimic of Dolichovespula maculata, the Bald-faced Hornet. see here:
http://bugguide.net/node/view/2890