  Group-theoretic arguments are used to determine the dependence of two-point
correlators of quark bilinears on the current quark masses. The leading
difference between $\pi$ and $\delta$ correlators is found to be of order $m_s$
times a U(1)$_{\scriptscriptstyle A}$-violating correlator. These general
arguments are consistent with Schaefer's observation that if
U(1)$_{\scriptscriptstyle A}$ violation persists to high enough temperatures
then the strange $\eta$ can be lighter than the non-strange one.
