In the preface to Sir Vincent B. Wigglesworth's classic 1939 book on insect physiology he asserted that insects provide an ideal medium in which to study all the problems of physiology. A strong case can be made as well for the use of insects as significant systems for the study of behavior and genetics. Contributions to genetics through decades of research on Drosophila species have made this small fly the most important metazoan in genetics research. At the same time, population and behavioral research on insects and other invertebrates have provid- ed new perspectives that can be combined with the genetics approach. Through such in- tegrated research we are able to identify evolutionary genetics of behavior as a highly signifi- cant emerging area of interest. These perspectives are ably described by Dr. Guy Bush in the introductory chapter of this book. During March 21-24, 1983, many of the world's leading scientists in invertebrate behavioral genetics were drawn together in Gainesville, Florida, for a colloquium entitled "Evolutionary Genetics of Invertebrate Behavior." This conference was sponsored jointly by the Department of Entomology and Nematology, University of Florida, chaired by Dr. Daniel Shankland, and the Insect Attractants, Behavior and Basic Biology Research Laboratory, U.S. Department of Agriculture, directed then by Dr. Derrell Chambers.