INTRODUCTION. 



The object of this List is to present a Catalogue of the well- 

 estabUshed species of each family, with a reference to where 

 they are described or figured, a few of the more important 

 synonyma, and the description of the species in the Museum 

 collection which appear not to have been before observed. 



It is intended for the following purposes : — 



1. As a List of the Species contained in the Museum col- 

 lection, with an indication of their origin. 



2. To point out the desiderata of that collection at the 

 period of publication. 



3. To describe the new species occurring in the collection. 



4. As labels for the collection. 



This part of the List has been prepared by Mr. Feederick 

 Smith, who has compared the specimens in the British Museum 

 collection with those in M. Chevrolat's Cabinet, containing many 

 type specimens, which he kindly sent from Paris for the purpose 

 of comparison, Mr. Smith ha.^ carefully collated the synonyms, 

 and described the species which appeared to be new. 



JOHN EDWARD GRAY. 



British Museum, 



Nor. mth, 1851. 



