Butterfly Wing Patterns and Mimicry, Volume 54, provides an essential reference for those interested in molecular Entomology and the study of natural selection. The volume spans work on the genetics of polymorphism in Heliconius butterflies through to a detailed analysis of the role of CRISPR-CAS in dissecting wing patterning. The volume covers both the evolution and fine scale development of both pattern and pigmentation. The role of wing shape is also considered for the first time in a formal analysis. It should be of interest to both experts and students interested in Entomology and its application to fundamental questions in evolution.