This volume contains the proceedings of the Third International Conference on Insect Neurochemistry and Neurophysiology (ICINN'89), which was held at the University of Maryland at College Park, Maryland, on July 10-12, 1989. The ICINN meetings were ini tiated in 1983 at a time when insect neurobiology was emerging as a vigorous sector of entomology, requiring a degree of attention and autonomy long before granted to its sister field, vertebrate neurobiol ogy. The distinctly medical aspects of the latter were replaced by potentiali ties for developing new approaches to insect control, and the...