This catalogue of the scale insect family Margarodidae (Hemiptera: Coccoidea) includes data on 442 species and subspecies that are placed among 77 genera. The family Margarodidae includes some destructive pests of agricultural crops such as citrus, coconut, grapevine, mango, oil palm, deciduous fruit trees, forest trees and ornamentals. On the other hand, several margarodid species are beneficial insects, as they produce components of economic importance. This book is a synthesis and catalogue of all the information published on these genera, species and subspecies worldwide from 1758 to December 2003, plus several works published in 2004. Data are provided on their correct scientific names, taxonomy, common names, synonyms, host plants, distribution, natural enemies, biology, economic importance and published references.