COLEOPTERA. 



479 



during the greatest part of the year, but principally in autumn. 

 During the winter they bury themselves in the mud and under moss. 



- 475- Pupa and larva of Dytiscus marginalis. 



The females lay their eggs in the water. The larvae are long, swelling 

 out at the middle, furnished with hairs, and grow rapidly. To 



Fig. 476. Dytiscus latissimus 



Fig. 477. Cybister Roeselii. 



undergo their metamorphosis into pupae they bury themselves in 

 the earth. 



The perfect insects are amphibious, and fly from one pond to 

 another to satisfy their voracious appetites. The most common 

 species of this genus is the Dytiscus marginalis (Fig. 474), of a dark 



