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 



Fig. 475. — Pupa and larva of Dyticus 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.— Dyticus 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 mo.st common 

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



