CONTENTS 
Page. 
jist of Descriptions. Y 
setter of Transmittal.VII 
leneral Record for 1889 and 1890. IX 
'he Fruit Bark Beetle. 1 
History in Illinois. 2 
History in the United States at large. 5 
European Accounts. 6 
Injuries to Vegetation... 6 
Description. 9 
Life History and Remedies. 10 
American Literature. 12 
European Literature. 18 
Experiments with the Arsenical Poisons for the Plum and Peach Curculio. 21 
Feeding Experiments. 21 
Insecticide Experimenis. 22 
Effect on the Foliage. 24 
?he American Plum Borer. 26 
Description. 28 
Literature. 29 
)n the Common White Grubs. 30 
Life History of Lachnosterna.. 31 
Pupae and Imagos of Lachnosterna from Earth. 37 
Laying and Hatching of Eggs. 38 
Hibernation. 39 
Life History of Cyclocephala. 40 
Food and Feeding Habits. 41 
Food of Larvae. 41 
Food of Imagos. 42 
Experiments with Remedies. 43 
Parasites. 44 
Description. 45 
List of Illinois Species. 47 
Key to the Illinois Species of Lachnosterna. 47 
Summary and Conclusions. 51 
idditional Notes on the Hessian Fly. 54 
Table of Breeding-Cage Results, New'and Old.. 60 
Experiments with Grasses. 61 
Practical Discussion. 62 
t Summary History of the Corn-Root Aphis. 6t 
Economic Suggestions. 69 
