Read to the Linnean Society in March 1864, this paper uses the swallowtail butterflies Wallace collected across the Malay Archipelago to study how species vary from island to island. He discusses variation linked to locality, the mimicry of protected species by others, and the geographical distribution of the group, closing with a full annotated catalogue.
A key paper in the early development of evolutionary biology, for readers following Wallace beyond The Malay Archipelago. Download the free EPUB.