SCHOOL ENTOMOLOGY 



PART I GENERAL ENTOMOLOGY 



CHAPTER I 

 DEFINITION OF THE SUBJECT 



1. Entomology Defined. Entomology is the study of 

 insects and may properly include facts of any kind what- 

 soever that pertain to insects or any of their activities. 



2. Insect Characteristics. Insects are animals belong- 

 ing to a branch of the animal kingdom known as the 

 Arthropoda. These animals all have, in their perfect state, 

 bodies made up of ringlike plates called segments, and they 

 have, on some of these segments, jointed legs. In some 

 members of the branch the segments are so nearly grown 

 together that they are not distinguishable. In some stages 

 of others, the legs are lacking, but all members of the 

 branch have, at some stage of their existence, at least, 

 traces of both these characteristics. The branch includes, 

 besides the insects, spiders and their relatives, centipedes 

 and millipedes, and crayfish and lobsters and their rela- 

 tives, of which there are many varied forms. 



3. Classification. Each one of these groups forms 

 what is known in Zoology (Zoology is the study of all 



