1. Alexandrowicz, J. S.: Notes on the nervous system in the Stomatopoda. I. The system of median connectives. Pubbl. Staz. zool. Napoli 23, 201?214 (1952).
2. Berlese, A.: Gli Insetti. Milan: Societ? Editrice Libraria 1909.
3. Bern, H. A., and I. R. Hagadorn: Neurosecretion. In: Structure and function in the nervous systems of invertebrates, vol. I p. 353?429, ed. by T. H. Bullock and G. A. Horridge. San Francisco and London: W. H. Freeman & Co. 1965.
4. Bessé, N. de: Recherches histophysiologiques sur la neurosécrétion dans la chaîne nerveuse ventrale d'une blatte, Leucophaea maderae (F.). C. R. Acad. Sci. (Paris) 260, 7014?7017 (1965).
5. Brady, J.: Histological observations on circadian changes in the neurosecretory cells of cockroach sub-oesophageal ganglia. J. Insect Physiol. (1967, in press).