ACKNOWLEDGMENTS FOR ILLUSTRATIONS 



Credit for illustrations used in this fieldbook should go to the fol- 

 lowing individuals and organizations: 



J. C. Allen and Son, Lafayette, Indiana, for figs. 42 top, 57 

 American Museum of Natural History, New York, N. Y., for figs. 



113, 114, 115, paintings by Charles R. Knight 

 James S. Ayars, Illinois State Natural History Survey, Urbana, 



for figs. 9, 85 

 Lynwood M. Chace, New Bedford, Massachusetts, for fig. 81 

 William E. Clark, Illinois State Natural History Survey, Urbana, 



for figs. 4, 58, 89 

 R. P. Grossenheider, St. Louis, Missouri, for the frontispiece, which 

 was reproduced through courtesy of the present owner, J. Mar- 

 shall Magner, also of St. Louis 

 E. Raymond Hall, University of Kansas, Lawrence, for figs. 61a, b, 



103 

 N. L. Huff, Museum of Natural History, University of Minnesota, 



Minneapolis, for fig. 78 

 Illinois State Department of Conservation, Springfield, for fig. 72 

 Illinois State Geological Survey, Urbana, for fig. 112 

 Illinois State Museum, Springfield, for fig. 45 

 Illinois State Natural Historv Survey, Urbana, for figs. 11 top, 43, 



44, 50, 59, 77, 86, 88, 93, 105 

 J. W. Jackson, Brush, Colorado, for fig. 76 

 Maslowski and Goodpaster, Cincinnati, Ohio, for figs. 47, 55, 63, 



64, 65, 75 bottom, 80, 82, 92, 94 

 Karl H. Maslowski, Cincinnati, Ohio, for figs. 79, 83, 90, 91, 96 

 Charles A. McLaughlin, University of Illinois, Urbana, for figs. 



39, 40, 51, 60, 61c, d, 73, 74 

 Lorus J. and Margery Milne, Durham, New Hampshire, for fig. 68 

 Missouri Conservation Commission, Jefferson City, for fig. 67 

 Carl O. Mohr, Illinois State Natural History Survey, Urbana, for 

 figs. 1, 2, 3, 5, 6 top and bottom, 7, 8, 10, 11 bottom, 12, 14, 15, 

 16-20, 21-24, 25-29, 30-34, 35-36, 38, 40, 41, 61*, /, 73, 95, 107, 

 108, 109, 117, 118, 119, for the small drawings of chipmunk, thir- 

 teen-lined ground squirrel, Franklin's ground squirrel, and east- 

 ern gray squirrel in the front of this book and on pages 212 and 

 222, and for the drawings on pages 218 and 219 

 Ernest E. Mulch, Phoenix, Arizona, for fig. 54 



Natural Resources Council, Conservation News Service, Washing- 

 ton, D. C, for fig. 69 



IX 



