CONTENTS, 
Page. 
List of Descriptions. ^ 
Letter of Transmittal — ;.^ ** 
General Record for 1887 and 1888. ^ 
Stndies on the Chinch Bug. II. 1 
Chinch-Bpg Injury Reported by Townships, 1887. 3 
Influence of Excessive Drouth. 5 
Effect of Abandoning Corn as a Crop. 5 
Successive Abandonment of Corn and Wheat. 6 
Secondary Effects of the Abandonment of Wheat. 6 
Relations of the Area of Wheat and other Crops to Chinch-Bug Injury. 7 
Collection of Data. b 
Study of Data. y 
General Remarks upon the Tables. .. 1(j ' 
Injury to Corn as Compared with Acreage in Wheat and other Grains (Tables 1-1V).... 11 
Injury to Grass as Compared with Areas in Wheat and other Crops (Tables V r -VIII).... 16 
Damage to Small Grain as Compared with the Area in Wheat and other Crops (Tables 
IX-XII). 
Comparison of the Crops for 1886 and 1887. 
Injury to all Crops combined, compared with average of each (Diagrams I-VI). 
Discussion of Diagrams. 
Summary of Current Opinion. 
Experiments... 
Insecticides. 
Barriers to Migration. . . 
Starvation Experiments. 
Contagious Disease.. 
Miscellaneous Notes and Observations. 
Summary and Conclusions. 
The Corn Bill Bugs. 
Analysis of Literature... 
Description of Genus. 
Key to Illinois Species. 
Immature Stages . 
Distribution . 
Life Histories . 
Injuries to Vegetation . 
Natural Enemies . 
Remedies.. 
Economic Bibliography. . 
Observations of the Food of the Snout Beetles (Rhynchophora) .— 
19 
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32 
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