Introduction 



The main purpose of all this care in preparing these Colored Plates 

 is to enable the reader to identify, in the easiest and most positive manner 

 possible, any specimens he may have procured. 



The title page opposite each plate gives the name of each specimen 

 and indicates the pages of the Bulletin on which it is discussed. 



Additional help in locating the pages on which any individual insect 

 is discussed may be had from the Outline of the Bulletin (page 3), the 

 "Key for Determining Insect Injury to Sugar Beets" (pages 5 to 8), 

 the Appendix (pages 138 to 146), and Index (pages 149 to 157). 



THE APPENDIX 



The Appendix (pages 138 to 146) contains an alphabetical list of the 

 popular names of insects and plants discussed, together with their scien- 

 tific names, credit for their determination, and illustration and page 

 references. The Appendix is mainly for the benefit of those wishing to 

 study the subject more fully than has been done in this Bulletin. 



THE INDEX 



The Index will be found at the back of the book, on pages 149 

 to 157. 



THREE METHODS FOR LOCATING DESIRED TEXT 



1. If you know the name of the insect, use the Index (pages 149 

 to 157) or the Appendix (pages 138 to 14b) to find the pages of the 

 Bulletin on which it is discussed. 



2. If you know the nature of the damage, but not the name of the 

 insect doing it, use the "Key for Determining Insect Injury to Sugar 

 Beets" (pages 5 to 8) or the Outline (page 3). 



3. If you have one of the suspected insects, but do not know its 

 name, use the Colored Plates (pages 1 1 to 27). 



Use both Methods 2 and 3 when possible, to make identification 

 more positive. 



In case of doubt as to the identity of an insect or other specimen, 

 or as to the nature of an injury, competent advice can always be obtained 

 by consulting the authorities of the Agricultural College, the County 

 Agents, or The Great Western Sugar Company's fieldmen. 



REFERENCE FIGURES 



The small elevated figures found occasionally throughout the text 

 after the mention of some insect, refer to the corresponding marginal 

 figure in the Appendix. The purpose of the reference is to connect the 

 particular species to its scientific name. 



BIBLIOGRAPHY 



The Bibliography (pages 147 and 148) contains a list of publications 

 on related subjects. Some of these have been drawn upon in the com- 

 pilation of this Bulletin, and credit given in the text. 



