140 The Ohio Journal of Science [Vol. XXI, No. 5, 



ACKNOWLEDGMENTS. 



In a survey involving necessarily so large a part of the 

 animal kingdom, the writer had to have the assistance of a 

 number of zoologists to make determinations in groups in which 

 they are specialists. The writer is glad to be able to credit 

 identifications to so many eminent specialists. To those who 

 kindly did this work and to all who helped in any way, the 

 writer wishes to express his great appreciation and thanks. 



Among insects various groups were identified as follows: 

 Prof. J. W. Folsom, Collembola; Dr. C. H. Kennedy, Odonata, 

 and mayfly nymphs; Dr. J. W. Malloch, Chironomidse, larvae 

 and pupae; Dr. H. G. Dyar, through the kind suggestion of 

 Dr. L. O. Howard, mosquito larvae and pupae; Prof. J. S. Hine, 

 some adult and larval Diptera of other families; Dr. Edna 

 Mosher, Coleoptera larvae; Dr. H. B. Hungerford, Corixidae; 

 Prof. Herbert Osborn, several Hemiptera and Thysanoptera ; 

 Mr. T: L. Guyton, aphids; Dr. C. W. Leng and Dr. PI. C. Fall, 

 several Coleoptera; and Mr. C. J. Drake, a water strider. 



Among other groups identifications were made as follows: 

 Prof. Frank Smith, Oligochseta; Prof. J. P. Moore, Hirudinea; 

 Dr. V. Sterki, Mollusca; Dr. Bryant Walker, fresh-water 

 mussels; Mr. Chancey Juday, Cladocera; Dr. C. Dwight 

 Marsh, Copepoda; Miss A. L. Weckel, Amphipoda; Prof. Wm. 

 M. Barrows, spiders; Miss Caroline Stringer, a few Turbellaria; 

 Mr. E. L. Wickliff, the fishes; and Prof. E. N. Transeau, the 

 plants. 



I am also indebted to Prof. R. C. Osburn for assistance in 

 determining the crayfishes, and help and suggestions relative 

 to fishes; Prof. Wm. S. Marshall for assistance, while studying 

 and comparing beetles with his collection; Mr. T. E. B. Pope, 

 for permission to examine beetles in collections at the Mil- 

 waukee Public Museum; Mr. P. R. Lowry, for examination of 

 his collection of aquatic Hemiptera; Prof. Herbert Osborn, for 

 suggestions and literature on Hemiptera; Mr. C. J. Drake for 

 data and suggestions on aquatic Hemiptera; Prof. F. H. 

 Krecker, for suggestions on ecological matters; Prof. Wm. M. 

 Barrows, for suggestions on the same matters and photograph- 

 ing of the map of Mirror Lake; Mr. E. A. Hartley for inking 

 the drawing of the lake; Mr. C. W. McCracken for the loan of 

 the campus map from which this drawing was made; and Prof. 

 R. C. Osburn for various other helpful suggestions. 



