  It is shown that the absolute rate of the semileptonic decays of the $\Xi_c$
baryons can be as much as two times higher than the semileptonic decay rate of
$\Lambda_c$ due to the Pauli interference of the strange quark. This
interference effect is still larger in the semileptonic decay rate of
$\Omega_c$. An experimental measurement of the difference of these rates would
thus provide an important piece of information on the spectator effects in
decays of hadrons containing a heavy quark.
