PROTECTIVE AND AGGRESSIVE MIMICRY 249 



has only two wings, instead of the four possessed by 

 the Hymenoptera and most of the other orders. 



Fio. 51.— Drone-fly (ErUtaHs), to the right, and bee on a carrot-blossom ; 

 natural size. 



Mimicry of Hymenoptera by Coleoptera 



Among the Coleoptera (beetles) a common English 

 beetle (Clytus arietis) resembles a wasp in a very 

 striking manner (see fig. 52). The slender waist, the 

 shape of the head and antennae, and the black, yellow- 



