  In this paper, we construct the additional symmetries of the fermionic
$(2N,2M)$-Toda hierarchy basing on the generalization of the $N{=}(1|1)$
supersymmetric two dimensional Toda lattice hierarchy. These additional flows
constitute a $w_{\infty}\times w_{\infty}$ Lie algebra. As a Bosonic reduction
of the $N{=}(1|1)$ supersymmetric two dimensional Toda lattice hierarchy and
the fermionic $(2N,2M)$-Toda hierarchy, we define a new extended fermionic
$(2N,2M)$-Toda hierarchy which admits a Bosonic Block type superconformal
structure.
