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Hello! :D

I've done some searching and found a fly like yours on flickr, comments suggesting first Heptozus on the front cover of the Manual of Central American Diptera (volume 1), the same person is then unsure due to the antennae and suggests Lysozus has shorter antennae with a caution.

http://www.flickr...061716612/

I can't find any photos of the other suggested species, but I found the Manual mentioned on google books with keys and notes below highlighting genera in South America.

http://books.goog...mp;f=false

I found another pdf with keys but this is for Central America, however many are in South America also.

http://afrotropic...myidae.pdf

There's some specimens on the Harvard Entomology site, I searched for order diptera, the database wasn't open to search for Neotropical so I searched on the page of diptera results for Stratiomyidae then had to click on each to see if it was Neotropical, there's several there with specimens which might be useful.

http://insects.oe...amp;-find=

Janet