INTRODUCTION. 19 



differences between spiders and insects are : the number of legs — 

 a spider having eight against six in insects; the head and thorax 

 are in one, known as a Cephalothorax ; the mouths are totally 

 different, a spider has no antennae, and no body segments, the 

 abdomen being in one piece, and the eyes are simple instead of being 

 made up of numerous lenses. Internally, the nervous system, the 

 digestive organs, and circulatory systems are quite different and 

 more highly developed in spiders than in insects. Spiders have no 

 larval stages , their eggs are usually laid in a woven silk envelope 

 and minute spiders emerge from these eggs and grow without any 

 material change of form. They are numerous at the water side, 

 and certainly deserve more attention from anglers than they have 

 so far received. 



