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Family Psocidae, Subfamily Psocinae
Thank you Liam and mjgierke for the ID. It helped with another spotting too:
http://www.projectnoah.org/spottings/102......
And thanks to Oxyjack too, for the early suggestion.
These are Barklice of some kind. Probably very close to these though I think Brazil is out of range for these:
http://bugguide.net/node/view/145393