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We show that a model for radio source dynamics we had earlier proposed canreadily reproduce the relationship between the radio power division separatingthe two Fanaroff-Riley classes of extragalactic radio sources and the opticalluminosity of the host galaxy, as found by Owen and Ledlow (1994). In ourscenario, when less powerful jets eventually slow down to the point that theadvance of the working surface (i.e., hotspot) becomes subsonic with respect tothe external gas, the jet's collimation is severely weakened. This criteriondistinguishes the powerful and well collimated FR II sources from the weakersources producing the less collimated FR I type morphologies.Comment: 6 pages, 1 figure; typo corrected; refs updated; now published in A&

The Fanaroff-Riley transition and the optical luminosity of the host elliptical galaxy