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Chrysops sp.
Here's a pic of a North American species: http://bugguide.net/images/raw/0HXRJZERZ...
Beautiful fly! The antennae are wrong for a tephritid fruit fly. I think it is a kind of deer fly (Family Tabanidae). Here's a picture of a deer fly, note the antennae: http://static.ddmcdn.com/gif/willow/deer...