The sequence of cDNA clones representing the 5' non-coding regions (NCR) and capsid regions of two bovine enteroviruses (strains PS-87 and RM-2; serotype two viruses) have been determined and compared with that obtained from a serotype one strain (VG-5-27). All three strains showed a longer 5' NCR compared to human enteroviruses and rhinoviruses due in part to a hundred residue insertion approximately at a hundred residues in from the 5' end. However, another domain occurring at nucleotide 187-222 in poliovirus is absent in each bovine enterovirus. Comparisons of the predicted structural protein amino acid sequences indicate that PS-87 shares most sequence identity with RM-2 and then with VG-5-27 in that order. The VP1 protein of PS-87 and RM-2 are shorter than the equivalent VP1 of VG-5-27 due in part to a truncation at their C-terminii. VP3 is only slightly smaller than VP2 in each virus.