COLEOPTERA 



29 



*' grubs." A resting stage, or pupa, follows the completion of growth 

 of the grub. Finally from the pupa emerges the adult beetle. 



Fig. 27. — A beetle, Lachnosterna. Original. 



The mouth parts are formed for biting. In one subgroup within 

 this order the head is prolonged in a sort of snout. This is not a 

 sucking organ, but bears at its 

 end true jaws, adapted for biting 

 and chewing. The larvai or 

 " grubs " of the snout beetles 

 have no legs. 



The antenna) are of many dis- 

 tinct types, ranging from simple 

 filiform or moniliform shapes to 

 complex types that can only be 

 classed as " irregular." Some of 

 the subgroups are commonly des- 

 ignated according to the kind of 



antenna; as, for example, the Clavicorns, the Lamellicorns, or the 

 Serricorns. 



Something like 20,000 species have been described. 



Fig. 28. — A nout beetle, Rhynchites. 

 Enlarged and natural size. Original. 



