The biochemical characters of the bacteria of the tribe are tabulated in order that conclusions may be drawn as to their taxonomic relationships. The evidence indicates that and all belong in a major subdivision of the family of tribal rank which justifies the recognition of the tribe The biochemical characteristics include in the tribe. The biochemical differences between the above-mentioned members are at generic level and the division of the tribe into four genera— — seems to be justified. and may be considered as two biogroups of the genus The serotypes of the genera are composed of many infrasub specific entities such as biogroups, biotypes and phage types; they are in reality more inclusive taxa and should be regarded as species. Proposals for the classification and nomenclature of the tribe are outlined.


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