In two separate papers submitted to a symposium in Barcelona in December 1987 on primary, generalized grand mal epilepsy becoming manifest in adulthood, the findings were so identical that the authors thought it appropriate to make a joint publication. L. Oller Daurella, after studying 90 cases, and L. Sorel, after studying 80 cases, propose the definition of a particular form of benign grand mal epilepsy in the adult. The various characteristics of this new entity are described.