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Eupsittula nana
Spotted @ "El Tajin" archeological site. Here is another website to watch the differences between subspecies: http://www.avianweb.com/jamaicanconures.... (Until 2013 Eupsittula species were considered to belong to Aratinga genus).
Venus thanks so much for your help, I was confused because of the orange on the top of the bill and believed it could be Eupsittula canicularis, but because of distribution it is unlikely to be found @ Veracruz, Mexico.
I think you're right, and this is probably Eupsittula nana astec, although some authorities recommend considering it as a separate specie "Aztec Parakeet" (E. astec).
http://en.wikipedia.org/wiki/Olive-throa...