  We discuss $SL(2,Z)$ subgroups appropriate for the study of $N=2$ Super
Yang-Mills with $N_f=2n$ flavors. Hyperelliptic curves describing such theories
should have coefficients that are modular forms of these subgroups. In
particular, uniqueness arguments are sufficient to construct the $SU(3)$ curve,
up to two numerical constants, which can be fixed by making some assumptions
about strong coupling behavior. We also discuss the situation for higher
groups. We also include a derivation of the closed form $\beta$-function for
the $SU(2)$ and $SU(3)$ theories without matter, and the massless theories with
$N_f=n$.
