The 1918 Electoral Redistribution, which took effect in 1919 election, saw a complete adjustment of the electorate's boundaries. Three quarters of Banks Peninsula, including the town of Akaroa, were now covered by the Lyttelton electorate. The Ellesmere electorate went across the Main South railway and extended all the way to the boundary between Canterbury and the West Coast, with Arthur's Pass and Harper's Pass located on that boundary. This brought many small communities on the Canterbury Plains into the electorate, including Springfield, plus settlement in the Southern Alps like Arthur's Pass and Cass.