This is the third Proceedings book to arise from biennial conferen ces on the Trace Amines. Since our first meeting in 1983 in Edmonton, Canada, progress has been brisk and, as will be seen from the ensuing pages, it is now possible to include major contributions from inverte brate neurobiologists as well as receptorologists. In the opening ses sion we heard about the distribution of the trace amines-now clear ly a misnomer-in insects and the pharmacological, receptor, and syn aptic characteristics of octopamine and tryptamine as well as the pos sibility of monoamines in general being targets...