CONTENTS 



Page. 

 The timothy stem-borer, a new timothy insect ( Mordellistena ustulata Lee.) 



W.J. Phillips.. 1 



Introduction 1 



History 1 



Distribution 2 



Character of attack 2 



Host plants 2 



Description of the different stages 3 



Life history and habits 6 



The egg 6 



The larva 6 



The pupa 7 



The adult 8 



Life cycle 8 



Hibernation 8 



Parasitic enemies 9 



Remedial measures 9 



The maize billbug (Sphenophorus maidis Chttn.) E.O.G. Kelly. . 11 



Introduction ,. 11 



History of the species 12 



Injuries since 1895 14 



Distribution 15 



Food plants 15 



Description and life history 16 



Number of generations 22 



Records of depredations . . 22 



Remedial measures 22 



Chinch-bug investigations west of the Mississippi River. 



E. 0. G. Kelly and T. H. Parks.. 23 



Introduction 23 



Distribution „ 23 



Description and number of generations 24 



Migrations 24 



Status of the chinch-bug problem in Kansas, Missouri, and Oklahoma .... 26 



Southern Kansas and northern Oklahoma, 1910 29 



Kansas, 1911 30 



Hibernation 32 



Preventive measures recommended 36 



Remedial measures 38 



Unsatisfactory remedial measures 39 



Plowing under infested crops 39 



Parasitic fungi 40 



Early observations 40 



Observations by the writers 41 



Summary 50 



1 The seven papers constituting this bulletin were issued in separate form on March 31, April 22, and 

 December 14, 1911, and April 10, April 22, May 31, and October 16, 1912, respectively. 



VII 



