This paper reports on the integration of the Arizona [Salmonella arizonae] group as sub-genus III into the Kauffmann-White-Scheme. For many years comparative serological analyses of all serotypes belonging to sub-genus III were carried out and detailed antigenic formulae were established which now, for the first time, are published in full. These detailed antigenic formulae are not only of the utmost significance for the precise definition of serotypes but are also of immense importance to reference laboratories, in particular for the production of specific diagnostic sera, their correct absorption and specificity control.