What is this insect from Brazil
This neotropical leafhopper belongs to the subfamily Coelidiinae. According to this publication though, there are 25 genera &amp; over 75 different species, and so, I'm having a difficult time narrowing it down from there (my current best guess would be genus Jikradia). 



If I'm not mistaken, this insect is displaying an alarming signal by spreading its wings like that.. it must have felt threatened by you when you were taking the picture (assuming that it wasn't already like that when you approached it). 

For more information on this subfamily, I strongly suggest that you explore the text of the previously linked publication, as it contains great information regarding the various tribes of subfamily Coelidiinae, including distribution, origin, host plants, a bit of history, and so forth.