Summary: Fifteen strains of two of and one of were studied by the immunodiffusion technique and the results were compared with those of a previous phenetic study. Both the serological and phenetic analyses demonstrated that was different from strains of and The latter two genera were phenetically distinguishable but demonstrated a comparatively close serological relationship. Those strains of and which shared a high number of precipitinogens also belonged to the same phenetic cluster, while strains which were less serologically related usually fell into different clusters. Thus there was good evidence of a general congruence between serological and phenetic similarity. The immunological results also supported the phenetic evidence in suggesting that many species in the genus should be combined. Similar evidence was obtained for the genus


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