DUALITY OF SP(2N(C)) AND SO(N-C) SUPERSYMMETRIC GAUGE-THEORIES WITH ADJOINT MATTER

We discuss electric-magnetic duality in two new classes of supersymmet ric Yang-Mills theories. The models have gauge group Sp(2N(c)) or SO(N -c) with matter in both the adjoint and defining representations. By p erturbing these theories with various superpotentials, we find a varie ty of new infrared fixed points with dual descriptions. This work is c omplementary to that of Kutasov and Schwimmer on SU(N-c) and of Intril igator on other models involving Sp(2N(c)) and SO(N-c).