  I comment on the proposal that the stability of dark matter may be due to an
unbroken Z_2 symmetry contained in the partially broken lepton flavour symmetry
group. I remark that (1) there is no Z_2 symmetry apparent in the lepton mass
spectrum and in lepton mixing, (2) predictive models of this type may be
constructed by using a lepton flavour symmetry group with three inequivalent
singlets, to which the three left-handed-lepton gauge-SU(2) doublets are
assigned, and (3) some predictions for the lepton masses and mixings are likely
to be altered by radiative contributions to the neutrino mass matrix. I
construct two models of this type in which the conserved Z_2 originates in a
lepton flavour symmetry group D_4.
