478 



THE INSECT WOKLD. 



dark greenish brown, yellowish on the sides. The elytra of the 

 male are smooth : those of the female are fluted. The front leg of 

 the male is provided with suckers. The larva is brown ; the pupa 

 of a dirty white. 



The Dytiscus marginalia sometimes attacks Hydrophilus piceus. 

 It pierces it between the head and the thorax, that is, in the 

 weak point of its cuirass, and devours it, in spite of it being the 

 stronger. The largest of the Dytisci, the Dytiscus latissimus, 

 (Fig. 476), is almost confined to the north of Europe. The Cybis- 

 ters abound especially in warm countries. The Cybister Rceselii 

 (Fig. 477), a European species, has the reputation of having been 

 taken in England. This group contains also a great number of 

 insects more or less resembling the preceding, in their conforma- 

 tion and habits. We will confine ourselves to representing a few 

 by figures : 



Fig. 478. Aiiliua sulcatus ^rnale). Fig. 479. Acilins sulcatus (female). 



FiR. 430. Fig. 481. 



Acilius fasciatus (male). Acilius fasciatus (female). 



Fig. 482. 

 Noterus crassicornis. 



