428 



TRANSFORMATIONS OF INSECTS. 



thorax by a broad base, the hinder legs being joined on to the 

 thorax close to it. Four legs are supported by the thorax on 

 either side, and the ocelli mark the front of the upper part of the 

 head, which is also joined by fusion, and not by a neck to the 

 thorax. In front of the rounded margin of the head, before the 

 eyes, are the long and stout jaws, one on each side, and they look 

 like the ends of a stout pair of scissor blades. A palp projects 



THE SCORPION. {Scorpio occita7inf.) 



from either side of the base of the jaws, and looks like a leg, but it 

 ends in a peculiar structure, and is not a locomotive organ. 



The abdomen is not jointed and has no visible segments ; the 

 web spinning apparatus exists; and this spider does not breathe by 

 tracheae but by pulmonary sacs. 



The integument of the spiders is precisely analogous to that 

 of the true insects, and has the same chemical constitution. In 

 the order of the pulmonary (sac breathing) Aradmida it may be 



