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Polistes erythrocephalus
Vespidae, Polistinae, Polistes sp. and looks like being Polistes erythrocephalus, which is very similar to the common Polistes canadensis which is also found in Costa Rica.
http://uwbrus.wordpress.com/2010/07/14/a...
http://www.vespidae.be/Polistinae/Polist...
http://www.projectnoah.org/spottings/638...
http://www.flickr.com/photos/29697818@N0...