This mask originates from the Oruro region of Bolivia. La Diablada is a masked dance to appease the evil spirit of the mines, and developed an additional meaning after Christianity took hold in the culture - it was adapted to represent good (Archangel Michael) versus evil (Lucifer).
Alpaca and friend. via Libby VanBuskirk, author of "Beyond the Stones of Machu Picchu: Folk Tales and Stories about Inca Life." There is a lot in the book about inca people's weaving and its meaning in their life.