Variegated Skipper

That's why it is called: Variegated...

Thanks a lot, Bayucca. I had compared my spotting with others, like this: http://www.projectnoah.org/spottings/762... but there are subtle differences between both, so I didn't dare to nail a name...

Another one from Argentina: http://www.projectnoah.org/spottings/126...

Thank you, ForestDragon

Sergio, it's a species of Skipper. I'm sorry but I don't know the ones in your area.