Standard model constraints on fermions

We present a catalog of fermions allowed by the standard model. These new fermious are restricted to sets which are anomaly free, vector-like with respect to electric charge and color, and have either ∆I_W = 0 (totally vector-like) or ∆I_W = 1/2 (chiral) (masses). We list some simple examples where the anomaliesof the leptons (quarks) cancel among themselves as well as against each other.

Supported in part by Department of Energy under contract No. DE-AS-05-81-ER0008.