iv ADDRESS. 



That many imperfections will be found in a work of this character is to be expected, the descriptions of many 

 of the species by the older authors being so concise and imperfect, that it is quite impossible to determine their 

 affinities without actual examination of specimens, whilst the loose and often incorrect localities given to the 

 species add greatly to the difficulties connected with their determination. So far, however, as the lists of species 

 are concerned, the book will, I trust, be found to be a complete " species insectorum," up to the present time, 

 having endeavoured in the supplemental pages to introduce every species which has been published during its 

 passage through the press. 



As regards the excellency of the Plates and the very careful manner in which they are coloured, our Sub- 

 scribers will be best able to form their own judgment. 



In conclusion, we have great pleasure in offering our best thanks to Dr. Boisduval, W. W. Saunders, Esq., and 

 the Authorities of the British Museum, for the liberal use which they have permitted us to make of their respective 

 Collections. 



J. 0. W. 

 August, 1852. 



