It is now more than twenty-five years since his useful “Key to Families of Coleopterous Larvae” was published by Macgillivray. Since that time descriptions of many larvae and representatives of a considerable number of families, then unknown, have been made available, and research on the taxonomy of families and super-families has added very considerably to our knowledge of the early stages of beetles. Without being invidious, it may not be out of place to mention the work of Saalas on spruce-beetles, of Verhoeff on several families and especially the Clavicorn group, of d'Orchymont on the Hydrophilidae, of de Peyerimhoff on the larvae of several obscure families, and, not least of these, that of Böving made known in a number of papers on the species, families and super-families of this order of insects. These and many others, too numerous to mention here, but whose names will in most cases be found in the bibliography, have made notable additions to our knowledge since the publication of Macgillivray's work.