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Dione moneta poeyii
Mexican Silverspot butterfly.
Desert landscape.
Very close, but yours is Dione moneta poeyii. You will see the difference with for Agraulis vanillae typical white spots on the forewings, which are missing in yours. But I must admit, without the partly open wing shot I would have had difficulties to separate Dione moneta from Agraulis vanillae.
http://www.butterfliesofamerica.com/L/di...