The nuclides 157W and 161Os have been discovered in reactions of 58Ni ion beams with a 106Cd target. The 161Os α -decay energy and half-life were 6890±12 keV6890±12 keV and 640±60 μs640±60 μs. The daughter 157W nuclei β -decayed with a half-life of 275±40 ms275±40 ms, populating both low-lying α-decaying states in 157Ta, which is consistent with a 7/2−7/2− ground state in 157W. Fine structure observed in the α decay of 161Os places the lowest excited state in 157W with Iπ=9/2−Iπ=9/2− at 318±30 keV318±30 keV. The branching ratio of View the MathML source5.5−2.2+3.1% indicates that 161Os also has a 7/2−7/2− ground state. Shell-model calculations analysing the effects of monopole shifts and a tensor force on the relative energies of 2f7/22f7/2 and 1h9/21h9/2 neutron states in N=83N=83 isotones are presented.