This volume serves as a comprehensive identification guide for the butterfly species found across the British Isles and the European continent. The authors, D. Hargreaves and L. Higgins, utilize their expertise in entomology to categorize diverse species through detailed physical descriptions and habitat analysis. The text provides a structured framework for naturalists and researchers to accurately classify specimens encountered in the field.

The work is regarded as a foundational reference for European lepidopterists due to its systematic approach and breadth of coverage. Its technical density and focus on precise identification markers make it a standard resource for both professional researchers and serious amateur naturalists.