X INTRODUCTION. 



When it is not expressly stilted to the contrary, the type specimens figured 

 have been presented to the U. S. National Museum collection l>y the gentlemen 

 whose names are given. Without mentioning each by name, my thanks are due 

 to the manv friends whose assistance has so greatlv aided me in the preparation 

 of this volume and added to its completeness, and whose cooperation will, I hope, 

 be continued until the work is finished. 



The original water-color drawings from which the plates have been repro- 

 duced were made by Mr. John L. Kidgwav, of Washington, 1). (/., to whose 

 skill and painstaking care the excellence of the illustrations is largely due. 

 The chromolithographic reproductions of these plates were made by the Ket- 

 terlinus Printing Company, of Philadelphia, Pa., and it gives me pleasure to 

 sav that they are as faithful copies of the original drawings as it is possible 



to make. 



THE AUTHOR. 



