X INTRODUCTION. 



J. Wright J Esq., as the illustrations of the species from Tro- 

 pical and South America and the West Indies, described 

 by Sir Hans Sloane, Browne, Wagler, Spix, Graven - 

 horst, Guilding, and others. 



The specimens purchased or procured in exchange from 



The Leyden Museum, as the types of the species described 

 and figured by Dr. Schlegel, in his Fauna of Japan 

 and in his Abhildungen, and by Dr. S. Muller, in his 

 work on the Reptiles of JVew Guinea, Borneo, ^c. 



The South African Museun, as the types of the species 

 described by Dr. A. Smith, in his Illustrations of the 

 Zoology of South Africa. 



M. Brandt's Collection, as the types of the species described 

 by Pallas, Eversmann, and other Russian naturalists. 



JOHN EDWARD GRAY. 



British Museum, 

 October 1, 1849. 



