INTRODUCTION. Vll 



This part containing the Chalciditous Insects of this order 

 has been kindly prepared by Francis Walker, Esq., F.L.S., 

 &c, who has devoted his attention to these Insects, has been 

 the original describer of the greater number of the species, and 

 has presented to the Museum the major part of the collection. 

 The Appendix of this part, written by Mr. Walker, contains 

 the descriptions of the hitherto undescribed species contained 

 in the collection. 



The part containing the other families ,will follow as soon 

 as they are prepared. 



JOHN EDWARD GRAY. 



British Museum, 



February 12th, 1846, 



