24 CoUc(jc of Forestry 



For the present purpose it has seemed sufficient to enumerate 

 the individuals present in the body of water under examination. 



Acknowledgments. The studies embodied in the follow- 

 pages have been carried on under the direction of Doctor Chas. 

 C. Adams, Professor of Forest Zoology in The New York 

 State College of Forestry, and to him and to Dean Hugh P. 

 Baker of the College the writer is indebted for the opportunity 

 of continuing the investigations begun in 191 5. As in the past 

 the author has received valuable counsel and helpful suggestion 

 from Doctor Adams as the work progressed, including the use 

 of his library. To the staff of the summer laboratory, consist- 

 ing, in addition to Dr. Adams, of Professor T. L. Hankinson, 

 Dr. Paul S. Welch, and Mr. A. G. Whitney, thanks are espe- 

 cially due for aid in collecting material and for suggestions 

 during the progress of the field work. To his wife, Mrs. 

 Lillian M. Baker, the author is particularly indebted for the 

 careful manner in which the records of the quantitative sta- 

 tions were made and for assistance in making the collections 

 and in preparing them for future examination. Mention should 

 also be made of Mrs. Baker's assistance in the preparation of 

 the quantitative tables. 



Quantitative investigations of this character are largely co- 

 operative, and the present report is no exception, as upwards 

 of twenty-two specialists have examined and reported upon the 

 various groups represented in the collections. To those who 

 assisted in this work, whose names are given below, the author 

 wishes to return his sincere thanks. In many cases the material 

 was of large amount and in difficult groups, but the work of 

 examination has been uniformly cheerfully and carefully done, 

 even at personal inconvenience. The assistance of these spe- 

 cialists is truly altruistic and is a notable example of the high 

 ideals of the majority of American scientific workers: 



Dr. Cornelius Bclten, New York State College of Agriculture, 

 Ithaca, N. Y. Trichoptera. 



Mr. VVm. J. Gerhard, Field Museum of Natural History, Chicago, 111. 



Coleoptera and Hemiptera. 



Prof. T. L. Hankinson, Eastern Illinois State Normal. Charleston, 111. 



Pisces. 



