  We present the results of a search for pair production of scalar top quarks
in an R-parity violating supersymmetry scenario in 106 pb-1 of ppbar collisions
at $\sqrt{s} = 1.8$ TeV collected by the Collider Detector at Fermilab. In this
mode each scalar top quark decays into a tau lepton and a b quark. We search
for events with two tau's, one decaying leptonically (e or mu) and one decaying
hadronically, and two jets. No candidate events pass our final selection
criteria. We set a 95% confidence level lower limit on the scalar top quark
mass at 122 GeV/c2 for Br (stop-> tau + b) = 1.
