Clinical peculiarities of interictal chronic epileptic psychoses were studied in 58 patients. The authors suggested a systematic of schizophrenia-like psychoses in epilepsy. Hallucinoses, paranoid, depressive, manic and catatonic psychotic states were described. The relationship between schizophrenia and epilepsy was discussed. It has been concluded that the character of personality changes plays a central role in the diagnostic of epileptic psychosis.