204 Bugs, Butterflies, and Beetles 



sand and allowing the moss to serve as the land. I 

 have such an aquarimn in the window now and all 

 winter I kept water beetles and other interesting 

 aquatic insects \\'ith some water bugs in it. 



It is my impression now that the water bugs 

 were the victors, for along towards spring I had 

 neglected my aquarium for some time and when I 

 looked in it for specimens from which to make 

 drawings for this book, the only two live creatures 

 left were two water bugs. I do not think the other 

 creatures died of starvation, but I strongly sus- 

 pect that the water bugs sucked the juice out of 

 them; even the caddice worms and snails were 

 sacrificed. 



The animals which prey upon other animals, 

 as do the lions, tigers and wolves among mammals, 

 the hawks and eagles among birds, and various 

 beetles, bugs and spiders among the insects, are 

 called " predaceous." INIost of the predaceous in- 

 sects are useful to man because they help destroy 

 their insect relatives which live on the leaves of our 

 trees and garden truck. 



THE DIVING BEETLES 



The Diving beetles (Figs. 178 and 179), the 

 larvae of which are called Water Tigers (Fig. 180), 



