seem as appropriate now as the original balance was when Dr A. D.
Imms' textbook was first published over fifty years ago. There are
35 new figures, all based on published illustrations, the sources
of which are acknowledged in the captions. We are grateful to the
authors concerned and also to Miss K. Priest of Messrs Chapman
& Hall, who saved us from many errors and omissions, and to Mrs
R. G. Davies for substantial help in preparing the bibliographies
and checking references. London O.W.R. May 1976 R.G.D. Part I
ANATOMY AND PHYSIOLOGY Chapter I INTRODUCTION Definition of the
Insecta (Hexapoda) The insects are tracheate arthropods in which
the body is divided into head, thorax and abdomen. A single pair of
antennae (homologous with the anten nules of the Crustacea) is
present and the head also bears a pair of mandibles and two pairs
of maxillae, the second pair fused medially to form the labium. The
thorax carries three pairs of legs and usually one or two pairs of
wings. The abdomen is devoid of ambulatory appendages, and the
genital opening is situated near the posterior end of the body.
Postembryonic development is rarely direct and a metamorphosis
usually occurs."
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