4 THE UNIVERSITY SCIENCE BULLETIN. 



Hemiptera which has facilitated greatly the preparation of 

 this work. 



To Dr. P. W. Claassen and Mr. Clyde Hamilton, of Cornell 

 University, and to Miss Ruby Hosford, Dr. C. P. Alexander, 

 Dr. Paul B. Lawson, Mr. Raymond Beamer and Miss Ger- 

 trude Standing, of Kansas University, for special assistance 

 from time to time, and to many others, who, one way or an- 

 other, have contributed to the completeness of this work, he 

 is most duly grateful. 



