We looked. Every now and again at a Sociables or an RG the topic arises. Mensas overall have large heads. A not insignficant proportion have really large heads.

In contrast, there is a racially-correlated incidence of small skulls. Brain volume has to go somewhere, what there is of it, causing the formation of an "occipital bun." It is a statistically inefficient way of packaging intelligence.

Of course, all races of Homo sapiens have equal intellgence as all dogs are equally intellgient. Beagles apparently know how to hide it.

Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/qz3.pdf