The newest volume in this series about the butterflies of the whole Palearctic, from North Africa and Europe to China and Japan. This volume is Part 1 for the Subfamily Papilioninae, covering the Tribes Leptocircini and Teinopalpini. Each volume of the series will cover 80-100 species with full colour illustrations, genitalia drawings, distribution, taxonomy, variations and diagnostic characters. Many well-known lepidopterists worldwide are contributing to this project, with the final result being a series of booklets with each one covering a subfamily, a tribe or a group of genera with a total of 50 to 100 species.