INSECTS 



171 



appearance) in the two kinds. What is the favorite rest- 

 ing position of each ? Which pair of legs do the back- 

 swimmers use for oars ? Which pair do the water-boat- 

 men use ? Water-bugs are predaceous, sucking the blood 

 of captured insects by means of a piercing beak. 



Moths and butterflies. — So many good books have 



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been written about the life of moths and butterflies, and 

 so surely ought one or more of these to be found in the 



