  The theory of doped excitonic insulators is reinvestigated in light of recent
experiments on hexaborides. For the appropriate valley-degenerate X_3,X_3' band
structure, ``intra-valley'' condensation is energetically favored.
Ferromagnetism occurs upon doping due to the quenching of kinetic energy at the
otherwise direct first-order excitonic insulator-metal transition. The phase
diagram includes states of spatially inhomogeneous density and magnetization at
low temperatures.
