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Mallodon molarius
Some king of Cerambycidae I think. Big one!
Probably Mallodon spinibarbis (Linnaeus, 1758)
http://www.argentinean-insects.com/Mallo...
This is a very common specie in Barro Colorado Island, I'm very sure of the specie
This is a Long horned beetle, I have the same specie http://www.projectnoah.org/spottings/639...
Try Lucanidae - stag beetles
http://en.wikipedia.org/wiki/Stag_beetle...
http://quaoarpowerzoo.blogspot.com.au/20...