INTRODUCTION. 
The principal object of the present Catalogue has been to 
give a complete list of the species of Aculeate Hymenopterous 
Insects that have been recorded as found in Great Britain, in- 
dicating at the same time their localities, and the species that 
are contained in the Collection ; the latter are indicated by the 
letters B. M. annexed. 
This Catalogue of Hymenopterous Insects has been prepared 
and the new species described by Mr. Frederick Smith, so 
well known for his attention to this order of Insects. 
JOHN EDWARD GRAY. 
British Museum , 
Sept. \0th, 1851. 
