Synopsis The aim of the author has been to present an account of the neuroendocrine system of insects, the super importance of which is well established, and also to provide information as far as possible directly, through the ultrastructural illustrations. Besides, an account of some of the hormonally controlled phenomena of vital significance is given. It is hoped that the theoretical account, and a large number of ultrastructural illustrations of some of the prominent pioneer authors included in the book, will provide ample information to the post graduate students and research scholars of insect neuroendocrinology as well as to those engaged in carrying out researches on comparative endocrinology, insect ethology, cell biology and developmental biology in carious universities and acquaint them well with almost all the components of the neuroendocrine system in the active, inactive and various developmental stages, alongwith ultrastructural changes occurring in the cells and their organelles, that are associated with specific functions. I do hope that the book will stimulate the readers and serve as a ‘text book cum basic research monograph’ on the subject. The book also contains a list of selected bibliography for a detailed study.