The characteristics of seven crystal-forming Bacillus spp. are compared and an identification key is presented. It is concluded that the following changes in nomenclature are desirable: Bacillus thuringiensis Berliner becomes the type species Bacillus thuringiensis var. thuringiensis n. comb.; Bacillus sotto Ishiwata becomes Bacillus thuringiensis var. sotto n. comb.; and Bacillus cereus var. alesti Toumanoff and Vago becomes Bacillus thuringiensis var. alesti.Two new species, Bacillus entomocidus n. sp. and Bacillus finitimus n. sp., and a new variety, Bacillus entomocidus var. subtoxicus n. sp., are described.
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