  We evaluate the antiproton--to--proton flux ratio which can be generated by
neutralino--neutralino annihilation in the galactic halo, considering the most
general compositions for the relic neutralinos and modelling the neutralino
local density according to its relic abundance. We find that in the case of
mixed neutralino compositions this $\bar p/p$ ratio is higher than for pure
higgsinos or gauginos. It is shown how the expected improvements in sensitivity
for the new measurements of the $\bar p/p$ may provide very useful information,
complementary to the one obtainable with other experimental means.
