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This fly had a metallic blue abdomen. It was feeding on an extrafloral nectary on an Inga tree (Inga sp.). Length to apex of abdomen 7 mm.

In a hotel garden, on the banks of the Rio Negro, Amazonas state, Brazil. 20 May 2012.

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Another angle.

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I just found this photo with a substantially different angle. Different individual, different plant, but same species of fly I believe.

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My guess is Tephritoidea (but not Tephritidae). Several genera have independently evolved marked wings and convergent R5 and M.

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Thanks, John. I just ran across a photo of a very similar fly from Costa Rica, on the blog of our BugGuide friend Troy Bartlett:

http://naturecloseups.com/posts/subjects/richardiid-flies

He says of his photo "I’m pretty sure this fly is a species in the family Richardiidae."

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Stephen,

This is a Richardiidae. Include this name in your title -- to attract the attention of an expert like Nosferatumyia or John Smit for further identification.

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Thanks, Eric!

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Obviously, a Richardia sp., but hardly further ID is possible w/o micro details of femoral chaetotaxy.