viii ANIMAL COMMUNITIES 



Mr. S. S. Visher and Mr. Ralph Chancy contributed most of the habitat data 

 on birds. Dr. R. M. Strong verified those included here which were 

 also compared with Butler's account (108). T. C. Stephens supplied the 

 photographs of nests. 



Dr. P. G. Heinemann, University of Chicago, Bacteria. 



Dr. Susan P. Nichols, Oberlin College, Algae. 



Mrs. Elva Class and Mr. M. M. Wells of the University of Chicago, and Dr. 

 W. C. Alice, of the University of Illinois, Gas analysis. 



Mariner and Hoskins, Commercial Chemists, Analysis of Water. 



The original records upon which the work is largely based could not 

 all be presented. Those placed at the end of the chapters are believed 

 to be representative, in that they include some characteristic animals, 

 some which are numerous but occur elsewhere also, and some of wide dis- 

 tribution. The records in the text are also largely original, except in the 

 case of mammals, the habitat locations of which are based upon literature. 

 Mr. W. H. Osgood of the Field Museum has assisted in the editing of the 

 data on mammals. Original records in this group are especially indicated. 

 Data on the nesting habits of birds have likewise depended upon compila- 

 tion, though the locality records are those of the persons mentioned. 

 Mr. W. S. Stahl, assistant United States attorney, edited the paragraphs 

 on the legal restrictions upon field study and collection of animals. 



The matter of scientific names is one presenting unusual difficulties 

 because of the scattered and incomplete character of catalogues. The 

 work of identification having occupied several years 1 changes in nomen- 

 clature may have led to some confusion and duplication of records under 

 different names. The matter of correcting spelling is unusually difficult 

 because of numerous works which it is necessary to consult for verification 

 in dealing with representatives of nearly all groups from Protozoa to 

 mammals. The specialists on the different groups have been very kind 

 in answering any question, but the final responsibility rests with the 

 author. In the main the nomenclature in the following works has 

 been followed (numbers refer to Bibliography at the end of this work) : 

 mammals, 21; birds, 108; reptiles, 157, 1570; Amphibia, 139 and 152; 

 fishes, 79; flies, Aldrich's ('oo) Catalogue (N.A.); beetles, 156 and 

 Samuel Henshaw's ('85) checklist; Hemiptera (Seteroptera), Bank's ('u) 

 Catalogue; aquatic insects, 95 and 96; ants, 54; insects not included 

 in the special lists, 177; Hymenoptera not in 177, E. T. Cresson's ('87) 

 Synopsis; spiders, 159; Phalangidae and land mites, 172 and 184; water- 

 mites, 149; myriopods, 183; mollusks, F. C. Baker's ('06) Catalogue 

 for Illinois; leeches, gia; crayfishes, 101, ioia; amphipods, 102; isopods, 



