CONTENTS. 



Page. 



Prefatory Note 5 



Introductory 7 



Zooiosical Position 8 



Specific Characters 9 



General Review 11 



Distribution and Dissemination 20 



Character and Extent of Injuries 25 



Development 27 



History of California Outbreak 33 



Discovery in New York State 36 



New Outbreak in Canada 37 



Natural Enemies 38 



Birds 38 



Mammals 39 



Predaceous Insects 39 



Plonr Weevils ( Triholium confusum and T. ferrugineum) 39 



Cadelle ( Tenebrioidis mauritanica) 40 



Gnathocerus cornutus 41 



Parasitic Insects 41 



Bracon brevicornis 41 



Chremylus rubiginosits 41 



Bracon hebetor 41 



Preventive and Remedial Measures and Mechanical Devices 43 



Cleanliness 44 



Fumigation Box 44 



Metal Spouts 44 



Attachment of Brushes to Belts 46 



Bisulphide of Carbon 47 



Sulphur 50 



Steam 52 



Steam and Sulphur 54 



Miscellaneous Expedients 55 



Bibliographical List 58 



