Plates and Explanations 



(All figures are natural size unless otherwise indicated.) 



The collection in which each specimen used for illustration 

 may be found, has been indicated in the explanation of the 

 plates. The abbreviations used are as follows : 



W. M. Collection of Walker Museum, University of Chicago. 



U. M. Collection of the University of Michigan. 



A. M. N. H. Collection of the American Museum of Natural 



History, New York. 

 U. S. N. M. Collection of the United States National Museum, 



Washington, D. C. 



I. S. M. Collection of the Illinois State Museum, Springfield, 111. 

 R. R. R. Collection of R. R. Rowley, Louisiana, Mo. 

 D. K. G. Collection of D. K. Greger, Columbia, Mo. 

 F. A. S. Collection of F. A. Sampson, Columbia, Mo. 



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