1. ABRAHAM, A. (1967), Die Struktur der Gehirnzentren des Gelbrandkäfers (Dytiscus marginalis L.), Z. mikrosk.-anat. Forsch., 76, 435–465.
2. ALLOWAY, T. M. (1972), Learning and memory in insects, A. Rev. Ent., 17, 43–56.
3. ASHURST, D. E. AND CHAPMAN, J. A. (1961), The connectivetissue sheath of the nervous system of Locusta migratoria: an electron microscope study, Q. Jl microsc. Sci., 102, 463–467.
4. BAERENDS, G. P. (1959), Ethological studies of insect behaviour, A. Rev. Ent., 4, 207–234.
5. BERANEK, R. AND MILLER, P. L. (1969), The action of iontophoretically applied glutamate on insect muscle fibres, J. ex p. Biol., 49, 83–93.