PREFACE. 



The publication of the fourth volume of North American Herpetology affords 

 me another opportunity to thank those gentlemen who have aided me in the 

 prosecution of this work. 



To Dr. S. Barker of South Carolina, I am indebted for many living specimens 

 of the Serpents of the lower section of the state, and especially for a magnificent 

 specimen of the Pituophis melanoleucus, or Pine Snake. 



Colonel James Ferguson has also procured me several fine specimens of the 

 Water-snakes inhabiting Cooper river. 



To Dr. Wurdeman I am indebted for many Serpents found among the moun- 

 tainous parts of our state, in the neighbourhood of Greenville. 



Dr. Edmund Ravenel has done much for me in Ophidiology; he has not only 

 furnished me with a great number of Serpents, but has made some excellent 

 remarks on their habits. 



To our distinguished Icthyologist, D. Humphries Storer, M. D., of Boston, I 

 owe many thanks for his aid in this volume, and especially for a living 

 Tropidonotus niger, or Water Adder, of Massachusetts. 



