A survey conducted in 1985 at the party conferences of the Belgian ecology parties Agalev and Ecolo, allows to brush an empirically based picture of the militants and the internal functioning of these parties. The "new middle class" background of the militants, the stratarchic order in the cadre party, the manifest links with the socalled "new social movements" and the specific brand of a new left-libertarian ideology all point to the new and different character of these parties, in comparison tothe established Belgian parties.