General Introduction -- Section I Sites of Neurotoxic Action in Insects -- The Insect Central Nervous System as a Site of Action of Neurotoxicants -- Acetylcholine Receptors: Purification, Structure, and Interaction with Insecticides -- Isomeric Forms of Acetylcholinesterase -- Novel Inhibitors of Insect Choline Acetyltransferase and Their Effects on Synaptic Transmission at an Insect Cholinergic Synapse -- Insecticide-Induced Release of Neurosecretory Hormones -- The Insect Neuromuscular System as a Site of Insecticide Action -- Section II Neurotoxic Actions of Synthetic Insecticides and Acaricides -- Neurophysiological Study of the Structure โ{128}{148} Activity Relations of Insecticides -- Toxicities of ?-BHC and Related Compounds -- Nitromethylene Heterocycles as Insecticides -- The House Fly Metabolism of Nitromethylene Insecticides -- The Cardiovascular Toxicity of Chlordimeform: A Local Anesthetic-Like Action -- Formamidine Pesticides โ{128}{148} Actions in Insects and Acarines -- Formamidine Pesticides โ{128}{148} Metabolic Aspects of Neurotoxicity -- Section III Neurotoxic Actions of Arthropod Venoms -- Effects and Chemical Characterization of Some Paralyzing Venoms of Solitary Wasps -- Chemistry, Specificity, and Action of Arthropod Toxic Proteins Derived from Scorpion Venoms -- Ant Venoms: A Study of Venom Diversity -- Actions of Some Neurotoxic Proteins of Black Widow Spider Venom 2