00977nam a2200133 a 450000100080000000500110000800800410001910000160006024500270007626000260010330000100012952006880013965000160082716428712017-08-15       1959    bl uuuu      00u1 u    #d1 aIMMS, A. D.  aOutlines of entomology  aLondon: Methuenc1959  a224p.  aInsects are segmemented animals with a relatively tough integument and jointed limbs. They breathe by means of air-tubes or tracheae and the body is divided into head, thorax and abdomen. The head is the sensory and feeding centre, bearing the mouthparts and a sigle pair of antennae homologous with the antennules of the Crustacea; compound eyes are usually present and often simple eyes or ocelli. The thorax is the locomotor centre, carrying three pairs of legs and usually two pairs of wings. The abdomen is the metabolic and reproductive centre; it contains the gonads and organs of digestion and excretion and usually bears special structures used in copulation and egg-laying.  aEntomologia