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Xenox tigrinus
Flying around back yard near deck off a busy street in city.
Very large, fly looking, appeared to be black and white in flight. Looks like a fly but the wings are moth like.
I'm not sure what this is, perhaps a bee fly. Check this page and others that follow it and see if any of them match your spotting: http://bugguide.net/node/view/55/bgimage...