

PREFACE. 



This Catalogue contains descriptions of all the known 

 species of Fossorial Hymenoptera, Formicidse, and Ves- 

 pidse, which have been discovered in Great Britain. The 

 habits of the genera and the peculiar osconomy of indi- 

 vidual species are given, as far as the observations of 

 several years have enabled the Author to record them. 

 Great attention has been paid to the synonymy, in the 

 hope of rendering it as perfect as possible ; and almost 

 every species has been carefully compared with conti- 

 nental specimens obtained from the best authorities. 



JOHN EDWARD GRAY. 



Dec. 15th, 1858. 



