The results of restriction analysis of toxigenic corynephages BF, phi 984, phi 9, and C are presented. Phage BF was shown to be a deletion derivative of phage beta vir, phage phi 984 to be omega-like. Toxigenic corynephages phi 9 and C belong to a new group of corynephages designated phi. DNA of phages phi 9 and C as well as chromosomal DNA of the indicator strains was not hydrolysed by specific Hind III endonuclease, that is likely to be associated with the presence of a modification system in host strains.