AQUATIC BEETLES 



bottom with a large bubble attached to its tail, which 

 clings to it with great tenacity and raises it above the 

 ground. While hanging from the surface the larva 



FIG. 20. Larva of Hydrobius fuscipes (magnified) ; head of do., under side; tail- 

 end, showing respiratory cup and tracheae. 



* 



executes a great variety of movements, bending its 

 body upwards, downwards, or sideways in search of 

 its prey. If kept in deep water for a long time it 

 drowns, 



