290 Fresh Water Aquarium 



the previous species in every respect and is 

 equally aggressive and bold a robber, but, on 

 account of its small size, is less dangerous 

 to larger aquatic creatures. 



The Large Black Water Beetle (Hydro pJlilus 

 piceus) is glossy black in color. The back 



Fig. 118. Large Black Water Beetle, 

 Hydrophilus piceus. 



is strongly convex. This is the largest 

 member of the family, but it is clumsy and 

 not nearly so good a swimmer as the Yel- 



