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Well, catch me one next time you are there and I will tell you for sure ... 100% ;) :D

But seriously, I don't know the neotropical fauna but if that landed on a flower infront of me in England then I would think it was a tachinid. The median vein is bent (but also happens in some muscids) but the general shape and those long, straight bristles on the abdomen really shout "Tachinidae" to me. Although some tachinids don't have bristles (the phasiines) and families like Sarcophagidae do have strong bristles, this one doesn't look like any of the alternatives so I am just left with Tachinidae ... but I still might be wrong and without a specimen I don't think we will know for sure :)