IV INTRODUCTION. 



If the generic name adopted be different from that first employed 

 for the species after the establishment of the Linnean system of no- 

 menclature, the name under which it was first described follows as 

 a synonyme, and where the Insect has received more than one spe- 

 cific name, those names are also given, as being sufficient for all 

 purposes of identification. 



These are followed by a reference to a few of the best original 

 figures of the species. 



In those cases where the two sexes of the same species, or any 

 particular individual state or variety belonging to it, have been 

 differently named, the name or figure exclusively appertaining to 

 the state or individual is placed after the indication of the specimen 

 to which it applies. 



This part, containing the Chalciditous Insects of this order which 

 have been procured chiefly from Mr. F. Walker since the former 

 part was published, has been kindly prepared by that gentleman, 

 who has devoted his attention to these Insects, and has been the 

 original describer of the greater number of the species. The Ap- 

 pendix of this part, also written by Mr. Walker, contains the de- 

 scriptions of the hitherto undescribed species contained in the col- 

 lection. 



The part containing the other families will follow as soon as they 

 are prepared. 



JOHN EDWARD GEAY. 



British Museum, 



April 20th, 1848. 



