NO. 630] HABITAT RESPONSES OF WATER STRIDER 81 



IX. Acknowledgments 



It is a pleasure to make certain acknowledgments to 

 various persons who have rendered assistance to me in a 

 number of different ways, while I was obtaining' the in- 

 formation necessary for the preparation of this paper. 



Dr. Charles C. Adams, professor of forest zoology in 

 The New York State College of Forestry at Syracuse 

 University, first directed my attention to the family 

 Gerridae as a suitable group for behavior and ecological 

 study. Some of the information recorded in this paper is 

 the result of certain work carried on under his general 

 supervision. If there are errors in the paper he is in no 

 sense responsible for them. I have had free access to 

 his private library, and he has given me many useful 

 suggestions. 



The late Mr. Charles A. Hart, systematic entomologist 

 of the Illinois State Laboratory of Natural History at 

 the University of Illinois, identified many water-striders 

 for me. He gave me the opportunity to study the water- 

 strider collection of the State Laboratory of Natural His- 

 tory, and he also aided me in a number of other ways. 



Dr. J. W. Folsom, of the Department of Entomology 

 at the University of Illinois, kindly loaned to me the 

 drawing of the water-strider which was reproduced: as 

 Fig. 1. 



Mr. C. A. Lloyde, photographer, of Champaign, Illi- 

 nois, rendered valuable aid in the taking of photographs 

 in the field, as did Mr. A. G. Whitnev, of Svracuse, New 

 York. 



Certain sums of money and a university fellowship, to 

 which I was twice appointed, were placed at my disposal 

 by the Graduate School of the University of Illinois. 

 These were of decided assistance in the prosecution of 

 investigations which made possible the preparation of 

 this paper. In this connection, recognition is due to Dr. 

 David Kinley, dean of the Gradnate School and to Dr. 

 H. B. Ward, professor of zoology. 



