210 



Aquatic Organisms 



The true bugs (order ITcmiptera) are mainly terres- 

 trial, and have undergone on land their greatest differ- 

 entiation. The aquatic ones are usually found in still 

 waters and in the shelter of submerged vegetation. 

 Tho comparatively few in species, they are important 

 members of the predatory population of ponds and 



Fig. 117. A giant water bug (Benacus griseus) 

 vertical surface under water, 



clinging to a 

 natural size. 



pools. They are often present in great numbers, if 

 not in great variety. The giant water bugs (fig. 117) 

 are amonf the largest of aquatic insects. These are 

 widely 1 1 from their habit of flying to arc lights, 



falling' h them, and floundering about in the dust 



of villa"". 1 



