An Introduction, giving notes on Nomenclature, Classification and Conventions; and Terms and Abbreviations, is followed by a History of the Scientific Nomenclature of Lepidoptera. In the Systematic Section, the meanings of over 4000 names are given. The nomenclature is that of Kloet & Hincks (1972) with more recent amendments. The specific names (each preceded by the Bradley & Fletcher Log Book number) are explained, together with the names of the genera, families and suborders to which they belong, giving both Latin and Greek roots. Appendixes include People commemorated in the names of Lepidoptera; Geographical Names and Unresolved Names. References and Indexes complete the work.