viii PREFACE 



of the injury inflicted, and the means of control — the last from 

 the standpoint of the commercial fruit-grower. At the end of 

 the discussion of each insect, references are given to a few of the 

 more important articles relating to the subject. These citations 

 indicate sources of our information and. will serve as a guide to 

 those who wish to pursue the subject farther. 



I am under great obligations to Professor P. J. Parrott, Dr. 0. A. 

 Johannsen, Dr. E. P. Felt, and Dr. Kobert Matheson, for carefully 

 reading and correcting the manuscript and for many helpful sug- 

 gestions. I have been unable to read the proof myself; this 

 tedious but important w^ork has been done by Dr. Matheson, 

 Mrs. Matheson, M. D. Leonard, and by Mrs. Crosby — to them 

 all I give my hearty thanks. 



Most of the illustrations are from photographs by Professor 

 Slingerland; a few have been kindly furnished by Professor 

 Herrick, H. H. Knight, and. Dr. Matheson. The drawings are 

 by Miss Anna C. Stryke. 



C. R. CROSBY. 



Cornell University, Ithaca, N. Y., 

 June 4, 1914. 



