INTRODUCTION. 



may be found quoted at length, up to the period of its publica- 

 tion, in Mr. Stephens' ' Systematic Catalogue of British In- 

 sects,' 8vo, 1829. 



The species in the British Museum Collection are indicated 

 by the letters B.M., annexed. 



This Edition has been carefully revised, and brought up to 

 the present state of the Science, by Messrs. H. T. Staixton 

 and Edwin Shepherd, so well known for their attention to 

 this part of British Entomology. 



JOHN EDWARD GRAY. 



British Museum, 



May 1, 1856. 



