Spencer reported more emu bones from King Island in 1910, which he compared to bones from Kangaroo Island which were by then considered to belong to D. peroni. The Australian amateur ornithologist Gregory Mathews coined further names in the early 1910s, including a new genus name, Peronista, as he believed the King and Kangaroo Island birds were generically distinct from the mainland emu.
Spencer's findings of emu bones on King Island in 1910 led to comparisons with bones from Kangaroo Island, which had been previously identified as belonging to D. peroni. The Australian ornithologist Gregory Mathews coined new names for the birds from King and Kangaroo Islands, including a new genus name, Peronista, based on his belief that they were distinct from mainland emus.