Actually probably just a big headed early human. But still fun!

Theories on Why Our Bigger Brained Predecessors Vanished
(Sonia Zjawinski, io9, 29 Dec 2009)

What’s weirder is that with further examination, it was discovered that whatever genus owned the skull also had small, childlike features — a Boskop face only takes up 1/5 of its cranium size, while a typical European adult face takes up roughly 1/3 of its cranium size.

Big head, small face? Sounds familiar, eh?

Lynch and Granger, who wrote about Boskops in their book Big Brain: The Origins and Future of Human Intelligence note in their Discover article that we aren’t the only ones to think of stereotypical extraterrestrials when we hear about Boskop characteristics. American anthropologist and naturalist Loren Eiseley wrote about this very idea in his book, The Immense Journey in 1958. “Back there in the past, ten thousand years ago. The man of the future, with the big brain, the small teeth. He lived in Africa. His brain was bigger than your brain. His face was straight and small, almost a child’s face.”

More info on the Wikipedia Boskop page of course.