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Eburodacrys crassimana.
Family: Cerambycidae - Sub family: Cerambycinae.
Hola Daniela. Intenta en ésta página http://coleoptera-neotropical.org/pagina...
Thank you Gordon, for the comment and the link. Yes, it is a long-horned beetle, I found it at night. I tried to find an ID in a page of argentine beetles, but I didn´t have good luck. I will try with your link.
This appears to be one of the long-horned beetles. They are quite common and have a world-wide distribution. Some are well outside their native ranges and are often invasive species as they can cause significant harm on trees and forests. To narrow your search for an ID you might want try http://wbbresource.org/default.asp?actio.... There may be other online resources as well. Good luck. If you can narrow the ID down more, I'd be interested in hearing what you came up with.