Vol. 33, Part 2 1973/74 THE ESSEX NATURALIST being the Journal of THE ESSEX FIELD CLUB Edited by David Corke Editorial This issue sees a number of changes to the Essex Naturalist—a new printer, a new editor and a new design. I hope readers will approve of the changes and find the contents interesting. The cover illustration shows Eristalis tenax, one of the many Essex hover-flies dealt with by R. M. Payne in this issue. The drawing is by David Lewis. Instructions for authors are no longer printed in the Naturalist. If you are planning to submit a paper please contact me before preparing the final typescript, so that details of lay-out and style can be discussed. David Corke, Dept. Biological Science, N. E. London Polytechnic, E15 4LZ. Published by The Essex Field Club at the Passmore Edwards Museum, Romford Road, London E.15