[en] New microsecond isomers in the neutron-deficient isotopes ^189g,190Bi have been identified after in-flight separation by the velocity filter SHIP. The evaporation residues were identified on the basis of delayed recoil- γ/X-ray, recoil- γ/X-ray- α and excitation function measurements. The systematics of the [ π1i _13/2]13/2 ⁺ excited states in the odd-mass Bi nuclei is discussed. (orig.)