  A group $H \cong {\mathbb Z}_{2}^{n}$, $n \geq 3$, of conformal automorphisms
of a closed Riemann surface $S$ such that $S/H$ has genus zero and exactly
$(n+1)$ cone points is called a generalized Humbert group of type $n$, in which
case, $S$ is called a generalized Humbert curve of type $n$. It is known that a
generalized Humbert curve $S$ of type $n \geq 4$ is non-hyperelliptic and that
it admits a unique generalized Humbert group $H$ of type $n$. We describe those
subgroups $K$ of $H$, acting freely on $S$, such that $S/K$ is hyperelliptic.
