386 



PHYLUM ARTHROPODA 



as may be seen by comparing, for instance, the hairy feet by aid of 

 which the fly runs up the smooth window-pane, the muscular Umbs of 

 grasshoppers, the lank length of those which characterise " daddy-long- 

 legs," the bees' legs with their pollen baskets, the oars of water -beetles. 



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Wings. — These arise as flattened hollow sacs, which 

 grow out from the two posterior segments of the thorax. 

 They are moved by muscles, and traversed by " veins " or 



