He left for Western Australia around 1858, and settled at Minnanooka station, Champion Bay, near Geraldton, with his brother Arthur Houssemagne du Boulay, who married Caroline Emily Josephine Howard[1] in 1867.
[2] He began collecting insects there, also in Victoria around 1869; Cooktown and Rockhampton around 1870, and in northern New South Wales and Sydney.
[3] Du Boulay was a talented pianist and concertina player, and was prominent at concerts in Melbourne, 1872–1876 including Robert Sparrow Smythe's Exhibition Concert Company, with singers Mrs Smythe (Amelia Elizabeth Bailey, soprano), Samuel Lamble (basso), and Mary Ellen Christian (contralto).
[5] He moved to Beechworth, Victoria, around 1888, and soon was immersed in the music scene; he helped organise a concert in aid of the public library and Burke Museum, contributing a fantasia on themes from Faust played on a symphonion.
[7] Around 1904 he left Beechworth for Beverley, Western Australia, where he taught music for many years, and died on 12 January 1914.