Missing definitions? GLbyte, GL_R8UI

I've just started using PyOpenGL and I've come across a couple of
definitions that I can't find anywhere.
I'm using PyOpenGL 3.1a1 with Python 3.3.

The culprits are:
GL_R8UI (sized internal format enum)
GLbyte (type)

Have I missed importing a package? My PyOpenGL related imports:
import OpenGL
OpenGL.FORWARD_COMPATIBLE_ONLY = True
OpenGL.ERROR_ON_COPY = True
from OpenGL.GL import *
from OpenGL.arrays import vbo
from OpenGL.GL import shaders

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