An interesting article, “Proverbs and prejudice: El Indio in Hispanic proverbial speech” by Shirley L. Arora (De Proverbio, Vol. 1, no. 2, 1995):
The proverbial speech of Hispanic America preserves, even today, numerous traces of the interaction between explorers, conquerors, or settlers and the native populations they found in the various regions of the so-called New World, while printed sources record others that have apparently disappeared from current usage. Many, though not all, of these expressions involve stereotypes of the Native American, some resembling those found in English, others diverging markedly from them.