A SHOET SUMMARY OF THE CHARACTERS OF INSECTS 

 AND THE ALLIED PESTS TREATED IX 

 THIS VOLUME. 



The Animal Kingdom is well known to be divided into two groups, 

 the so-called A^ertebrata and the Invertebrata. To be more accurate, 

 into what are known as Chordate and Achordate animals.* 



The present volume deals only with the latter. It is hoped 

 at a not far distant date to follow with a second volume of much 

 smaller dimensions dealing with A^ertebrate enemies, Animals and 

 Birds. 



The groups of iu\'ertebrata of economic importance to the fruit- 

 grower are the Jointed- Limbed Animals or Arthropoda, the Snails 

 and Slugs or MoUusca, and the AVorms or Vermes. The majority 

 of the injurious creatures come in the first group ; the damage done 

 by Slugs and Snails is very limited, and that done by A\^orms is 

 almost exclusively confined to one family — the Eelworms which 

 attack the strawberry. 



A. The Artheopoda or dointed-Limbed Animals can at once 

 be told by the following characters : — 



(1) TJie body is divided into a number of rings or segments 



running in the longitudinal axis. 

 {'2) The appendages are composed of a number of joints, both 



those which are ambulatory and those which are sensory, 

 (o) They develop by means of a more or less complicated series 



of stages, known as the metamorphosis. 



I>. The A^EKMES or AVorms can at once be told from the former 

 by the complete absence of jointed appendages in the form of limbs 



* Those who wish to follow this subject of structure and classification 

 more closely are referred to any modern text-book on zoology or my ' Text- 

 book of Agricultural Zoology,' published by Blackwood & Sons. 8s. 6d. 



