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INTRODUCTION. 



The principal object of the present Catalogue has been to 

 give a complete list of the specimens of Hymenopterous In- 

 sects contained in the collection of the British Museum, indi- 

 cating at the same time the peculiarities of each, as regards 

 variations in colour, locality, and the source from whence it- 

 has been derived. 



With this view, the different individuals of each species 

 contained in the collection are indicated by the letters a, b, c, 

 &c, following the name of the species, and its synonymes. 



The habitat is given as particularly as the materials pos- 

 sessed by the Museum permit ; but it is often impossible to 

 give the place from whence they are derived, except in the 

 most general terms. 



Those specimens which have been presented to the Mu- 

 seum have the name of the donor marked immediately after 



