  There are serious discussions for building a muon collider with
$\mu^{+}\mu^{-}$ collisions at c.o.m. energies up to 4 TeV. We point out that
the bileptonic gauge bosons predicted in some extensions of the Standard Model
would be readily discernable from the backward scattering cross-section, for
bilepton masses up to a substantial fraction of the c.o.m. energy.
