494 



THE INVERTEBRATA 



The second suborder, the Polyphaga, includes a large number of 

 families grouped into several superfamilies the members of which 

 show much variation. There is a tendency towards reduction in the 

 number of tarsal joints from five to three, and though some forms 

 possess filiform antennae, clavate (clubbed), geniculate (elbowed), 



Fig. 341. The hornet, Vespa crabro. A, Larva. B, Pupa. C, Adult S' 



Fig. 342. Three types of Coleoptera. A, Ocypus olens (Staphilinidae). B, 

 Scarahaeus Thomsoni (Scarabaeidae). C, Corymbites cupreus (Elateridae). 



and lamellate (segments extended to form a "book" of closely 

 arranged leaves or lamellae) antennae occur, as in the Coccinellidae, 

 Curculionidae and Scarabeeidae respectively. Larvae vary from the 



