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Chrysomelidae, Galerucinae, Alticini and looks like being Omophoita sp.. But then the tricky story starts. There are several very similar and unfortunately also variable ones around. For me it looks like being a mixture of Omophoita personata, Omophoita albicollis and an unknown one.
http://www.projectnoah.org/spottings/163...
http://www.coleoptera-neotropical.org/pa...
http://www.projectnoah.org/spottings/808...