CONTENTS, 



PAGE 



Introductory Note ,,. viii 



The Corn Bill-Bugs in Illinois 1 



Usual Conditions of Injury to Corn 2 



General Features of Life History 2 



General Preventive Measure 3 



The Little Brown Bill-bug ; the Blue-grass Bill-bug. {Sphenophortis parvu- 



lus Gyll.) 3 



Discussion of Life History 3 



Occurrences of the Adult Beetle 3 



Occurrences of Immature Stages 6 



Instances of Injury to Corn 7 



Sphenophonis placidus Say... 8 



The Clay-colored Bill-bug [Sphenophorus ochreus'Lec.) 9 



Injury to Corn in Ford County, 1888 9 



Experiments with Bill-bugs on Corn 11 



Injuries in 1889 12 



Observations on Life History 12 



Injuries in Whiteside, Adams, and Schuyler Counties 13 



Extraordinary Injury to Corn in Greene County 14 



Summary of Life History 16 



Descriptive Notes 17 



Sphenophorus pertinax Oliv 17 



Sphenophorus cariosus Oliv .'. 19 



Description of Larva 21 



Additional Species 21 



Sphenophorus scoparius Horn 21 



Sphenophorus scnlptilis Uhler 21 



Sphenophorus robustns Horn 22 



Recent Bibliography 23 



Methods and Results of Field Insecticide Work against the San Jose Scale, 



1899 1902 27 



Experience with Orchard Fumigation 31 



Description of Equipment 31 



Description of the Operation 32 



Preliminary Operation at Monticello 33 



Orchard Fumigation at Sparta 34 



General Results 35 



Details of the Work and its Results 36 



Orchard Fumigation at Richview 38 



Details of the Richview Work 39 



Comments on the above Results 42 



