The electrical conductances of lithium and sodium perchlorates and of some quaternary ammonium halides and perchlorates in propylene carbonate (PC) + tetrahydrofuran (THF) (1:l in volume) have been measured at 25 OC. The conductance data were analyzed by a minimization technique using the complete form of the Fuoss/Hsia (F/H) equation. All electrolytes were found to be anomalous in showing unusually higher molar conductances than in each solvent alone. The effect of the variation of the three parameters KA, A,, and a was fully investigated.