PREFACE 



Not all insects of economic importance are in- 

 cluded in these outlines. To discuss them all, a 

 book many times the size of this would be needed. 

 However, the principal pests of our important 

 fruits, vegetables, cereals, farm animals, shade- 

 trees, and of the household are discussed. A brief 

 summary of the life habits of each, so far as they 

 are known, is made, and the latest methods of con- 

 trol are outlined. In addition, a concise discussion 

 of insecticides is given together with formulae and 

 directions for making and applying them. 



Since the first edition of these outlines was pub- 

 lished important advances have been made in our 

 knowledge of the habits and control of many in- 

 sect pests. Therefore, in this new edition some 

 changes in the text and many additions to it have 

 been made in an attempt to bring it down to date. 



As in the previous edition, references are again 

 given to the more important sources of information 

 regarding the insects and their control. As far as 

 possible, references are made to bulletins available 

 to the general student and to those publications giv- 

 ing faithful illustrations of the insects, together 

 with the most approved methods of control. 



