  Let M_{g,n} be the moduli space of stable genus g curves with n marked
points. M_{g,n} has boundary strata consisting of nodal curves. The fundamental
classes of these boundary strata may be linearly dependent in the Chow group
A_*(M_{g,n}). Relations among these boundary strata can be found by exploiting
a localization trick involving stable maps to P^1. This note explains this
trick and applies it to give a new derivation of Getzler's relation among
codimension 2 boundary strata in M_{1,4}.
