xiv INTRODUCTION. 



nell University; Prof. J. S. Hine, Ohio State University; Prof. E. S. 

 Titus, Utah Agricultural Experiment Station ; Dr. A. G. Ruthven, Univer- 

 sity Museum, University of MicJiigan, and Mr. A. B. Wolcott, Field 

 Museum of Natural History. 



The volunteer members of the Museum party should be mentioned in 

 this connection : Dr. K. A. Brown, Dr. H. A. Gleason, Mr. W. P. Holt, 

 Mr. Max Minor Peet, Mr. Otto McOrearj^, and the writer. It will be 

 evident that the volunteer work of this report comprises the major part 

 of it. 



Personally the writer wishes to express his appreciation of the assist- 

 ance of Mr. Walker and Mr. White; of the cooperation of the members 

 of the party and the many specialists who have examined the specimens; 

 and of the valuable suggestions and assistance of : Mr. Norman B. Conger, 

 Inspector U. S. Weather Bureau, Detroit; Dr. Glover M. Allen, Boston 

 Society of Natural History; Mr. Frank Leverett and Mr. P. B. Taylor. 

 of the U. S. Geological Survey; Prof. H. F. Wickham, State University 

 of Iowa; and to Mr. A. B. Wolcott, of the Field Museum of Natural 

 History. Also to Dr. A. C. Lane of the Michigan Geological Survey for 

 many favors and courtesies, including the preparation of the topographic 

 map, and to Dr. A. G. Ruthven, Chief Field Naturalist of the Survey, 

 for assistance in the publication of the report. 



The shortcomings of this report will be no more evident to any one 

 than to the writer. If, however, with its defects, it preserves some "van- 

 ishing data," and presents suggestions for the improvement of such 

 ecological surveys, it will have served the purpose for which it was 

 intended. 



CHAS. C. ADAMS. 

 July 23, 1908. 



Hull Zoological Laboratory, 

 University of Chicago. 



