THE KANSAS UNIVERSITY 
SCIENCE BULLETIN 
VoL. XI.] DECEMBER, 1919. [ vote Now? 
The Biology and Ecology of Aquatic and 
Semiaquatic Hemiptera * 
BY H. B. HUNGERFORD. 
Department of Entomology, University of Kansas. 
ACKNOWLEDGMENTS. 
The writer wishes to acknowledge herewith his indebted- 
ness to those who have aided him in his work. 
First, to Dr. James G. Needham, of Cornell University, 
under whose direction these studies were made, he feels the 
_ deepest obligation and gratitude for the incentive and oppor- 
tunity to investigate this neglected ecological group. His 
helpful, kindly suggestions and his broad limnological exper- 
ience have ever been a source of inspiration to the writer in 
the preparation of this thesis. 
To Prof. S. J. Hunter, of Kansas University, for so gener- 
ously placing at his disposal time and equipment sufficient to 
complete these studies. 
To Miss Ellen Edmonson, of Kansas University, to whose 
patient and painstaking care is due the accuracy and sightli- 
ness of many of the illustrations. 
To Mr. J. R. de La Torre Bueno, who has loaned and identi- 
fied material so generously and whose writings upon special 
studies have been exceedingly helpful. 
To Mr. Edmund H. Gibson, of Washington, D. C., who has 
extended, whole heartedly, the facilities at his command. 
To Mr. E. P. Van Duzee, for bringing out a catalog of the 
* Submitted to the Department of Entomology and the graduate faculty of Cornell 
University in partial fulfillment of the requirements for the degree of Doctor of Philosophy, 
July. 1918 
Received for publication November 15, 1919. 
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