[EDIT – okay, seems like this is probably nonsense. See the link at the end]
Prehistoric Eloi! Pretty speculative though. Via C.
The idea that giant-brained people were not so long ago walking the dusty plains of South Africa was sufficiently shocking to draw in the luminaries back in England. Two of the most prominent anatomists of the day, both experts in the reconstruction of skulls, weighed in with opinions generally supportive of Haughton’s conclusions.
The Scottish scientist Robert Broom reported that “we get for the corrected cranial capacity of the Boskop skull the very remarkable figure of 1,980 cc.” Remarkable indeed: These measures say that the distance from Boskop to humans is greater than the distance between humans and their Homo erectus predecessors.
Who Were The Boskops And Were They Really Smarter Than Us?
Buuuuuut see also this critique: