APPENDIX. 



INTRODUCTION TO ENTOMOLOGY. 



WITH 



LIST OF OEDEES OF INSECTS. 



In the foregoing observations on Insect Attacks, references 

 are given to many standard works, in some of which the 

 student will find full histories of the insects referred to, and 

 in others will be able to find full information regarding method 

 of Classification of Insects generally; or again, if he desires to 

 study any special order in detail, he will find references to 

 standard monographs on these subjects. 



But for general working purposes it may be convenient to 

 have a short account at hand of such of the main points of 

 distinction between the different Orders of Insects, as will 

 enable the observer of a crop attack to tell at least what kind 

 of insect is before him, and also, what is of great importance 

 agriculturally, how to distinguish generally between the 

 different kinds of lari-(e which are commonly most injurious 

 to our crops, so that he may be able to tell whether the crop 

 pest under consideration is a fly-maggot, a beetle-grub, a 

 moth-caterpillar, or possibly not an insect at all. 



In the following pages I have, therefore, endeavoured to 

 give (in the list of the Orders of Insects, following the des- 

 cription of methods of insect life) notes of the most observable 

 of the characteristic points by which the insects composing 

 these different Orders may be distinguished from each other 

 in their early as well as complete state. But in the small 

 space available it is only the broad general distinctions, such 

 as most commonly are noticeable, that it is possible to enter 

 on, and the reader is especially requested to observe that this 

 Introduction is only intended as a guide to the main points 

 desirable for notice in practical study of British injurious 

 insect attacks. 



For those who wish to study the subject in detail, I know of 

 no work superior to that on * Classification of Insects,' by 



