US Hawaiian People Mask: "Tiki"

This is a US Hawaiian mask called a "tiki." Tiki masks originally were used to stand in for deities protect their users from evil spirits and to increase the mask wearers’ fertility and luck. 

The masks were often carved to take on the specific trait of a certain god and the artist would shape their facial expressions to resemble that trait. For instance, a tiki mask meant to infuse its wearer with strength would look like a large, strong man, while one meant to increase fertility could be carved to look like a sensual woman.

However, not all tiki masks represented gods in the Polynesian and Hawaiian cultures. Tiki masks have served as a valuable form of folk art and artistic expression.
Source:
http://www.tikishackimporter.com/tiki-mask-history.html