  We consider a certain super extension, called the super tau-cover, of a
bihamiltonian integrable hierarchy which contains the Hamiltonian structures
including both the local and non-local ones as odd flows. In particular, we
construct the super tau-cover of the principal hierarchy associated with an
arbitrary Frobenius manifold, and the super tau-cover of the Korteweg-de Vries
(KdV) hierarchy. We also show that the Virasoro symmetries of these
bihamiltonan integrable hierarchies can be extended to symmetries of the
associated super tau-covers.
