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Dynastes Tityus
Big beetle with dark head. Body ight green with dark spots. Second pic shows the horns.
Oak forest
Actually, you have a minor male.
Males are variable in horn development from small spurs (as seen here) to long horns. Females lack the thoracic horns and have a more punctated or rugose surface texture to the pronotum.
Great find, Luis! This is most certainly in the genus Dynastes, but I'm unsure of the species.