  I present a calculation of the topological susceptibility $\chi_T$ in
$SU(N_c)$ gauge theory with $N_c=3-5$ colors and $N_f=2$ degenerate flavors of
fermions. The results lie on a common curve when expressed in terms of the
combination $N_c m_{PS}^2 t_0$ where $m_{PS}$ is the pseudoscalar meson mass
and $t_0$ is the flow parameter. $\chi_T$ approaches its quenched value as the
pseudoscalar mass becomes large. The lattice simulations use clover fermions.
They are done at a single lattice spacing, roughly matched across $N_c$, and
over a restricted range of fermion masses.
