PREFACE. 
Tue principal object of the present Catalogue has been 
to give a complete list of all the known species of Fosso- 
rial Hymenoptera, at the same time indicating those at 
present contained in the Collection of the British Museum. 
This Part of the Catalogue contains the MutTituipa 
and Pompryip#, and has been prepared by Mr. FREDE- 
rick SmirH, who has taken every care in the deter- 
mination of the species, in referring to the synonyma, and 
in the descriptions of those species which appear to have 
remained hitherto undescribed. 
The remaining Parts will follow as soon as they can be 
completed. 
JOHN EDWARD GRAY. 
7 March 1855. 
