EDITOR'S rREFACE. 



The Cetoniin^ and the DynastinjE are two of the smaller 

 Sub-families into which the large Family of Scarab^id^ is 

 usually divided. 



The Cetoniin^e are in the main an Old-World Group, 

 comparatively few species being found in the New World : 

 this is especially true of South America. They are well 

 known for the brilliancy of their coloration and for the 

 beauty of their form. The Rose- Chafers of Great Britain 

 are familiar examples of this Sub-family. 



There is, however, no representative of the Dynastin^ in 

 Great Britain, and hardly a dozen species in Europe. They 

 are, as this volume shows, distinguished by the possession 

 of horns and projections on the head and prothorax, the 

 use of which is still a matter of speculation rather than of 

 observation. 



In this volume Mr. Arrow deals with perhaps less than one- 

 sixth of the great " Series " of Lamellicornia — Beetles 

 which are economically important, many of them doing 

 great damage to all sorts of crops, both above and below 

 ground. They further present many unsolved biological 

 problems associated with the exceptional exuberance of their 

 colour, pattern, armature, etc. It is greatly to be desired 

 that the Author should be able to continue his most efficient 

 work on other Families and Sub-families of this " Series." 



