  We study the thermal phase diagram of pure SU(3) gauge theory with
fundamental and adjoint couplings. We improve previous estimates of the
position of the bulk transition line and determine the thermal deconfinement
transition lines for $N_t=2,4,6,$ and 8. For $N_t > 4$ the deconfinement
transition line splits cleanly away from the bulk transition line. With
increasing $N_t$ the thermal deconfinement transition lines shift to
increasingly weaker coupling, joining onto the bulk transition line at
increasingly larger $\beta_a$ in a pattern consistent with the usual
universality picture of lattice gauge theories.
