A wide variety of free living, commensal and parasitic flagellates constitute the protozoan order of Kinetoplastida. Any attempt to consider the group as a whole is, therefore, and ambitious and difficult undertaking. However, this volume has accepted this challenge. In the present volume, emphasis is placed primarily upon the trypanosomes. The diversity is morphology and habitat among kinetoplastid flagellates is covered and also provided is an updated cogent summary of revised classification for the group. These organisms are well demarcated by their possessing a conspicuous extra-nuclear mass of DNA - the kinetoplast. Nevertheless most of the articles deal with trypanosomes. The 12 reviews have been abstracted individually but briefly they consider the taxonomy and the comparative cell biology of kinetoplastid flagellates, the trypanosomes of birds, of bats, of non-human primates, the subgenera Megatrypanum and Herpetosoma, biochemical taxonomy, oxidative metabolism and the antigenic variation of salivarian trypanosomes. Considering the volume as a whole, it is a brilliant review of a wide field of science and it will undoubtedly become a standard book of reference concerning trypanosomes, leishmaniae, and other kinetoplastids.