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Pollenia sp.
this fly had a yellow thorax and black and white abdomen.
J,I found a very similar image of a male Pollenia sp. Your ID was correct! Great work! Thanks!
http://en.wikipedia.org/wiki/File:Pollen...
J.I looked at the images in the link that you provided and Page 2 image 3 resembles this spotting. I wish the abdomen could be seen though. But some of the flies on page 1 do have black and white markings on the abdomen.