PREFACE. 



This publication includes a number of articles relative to insects 

 attacking grain and forage crops. \ Although numbered consecu- 

 tively, each paper is complete in itself, and, with a single exception, 

 the species discussed have each been followed through their entire 

 life cycle from egg to adult; the exception being Part VI, which is a 

 contribution to a knowledge of the corn root-aphis, Aphis maidi- 

 radicis. 



In Parts I to V and VII the species had not previously been care- 

 fully and exhaustively studied, and hence the information given is 

 almost entirely new and original. In Part VIII, beside the inclusion 

 of much new matter, previous errors are corrected and our knowledge 

 of the cowpea curculio, Chalcodermus seneus, is practically completed. 



While only two of the eight papers included in this bulletin relate 

 to grain- affecting insects, this does not imply that greater stress is 

 being placed on the investigation of forage insects. The two papers 

 referred to happen to be pieces of work that were completed in time 

 to include them in this publication. Of eight papers now reaching 

 completion, which will be included in a similar publication in the 

 near future, all but one relate to insects attacking growing grains. 



F. M. Webster, 

 In Charge of Cereal and Forage Insect Investigations. 



