  A representation of a finite group $G$ on a finite dimensional vector space
$V$ is called \textbf{unisingular} if every $g\in G$ has 1 as an eigenvalue in
its action on $V$. In this paper we show that certain unisingular
representations can be realized as mod 2 representations of hyperelliptic
Jacobians over $\Q$. We additionally identify new unisingular representations
of the symmetric and alternating groups.
