BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 33 
2GG. Cockerell, Theodore D. A. The Colorado beetle. < Ento¬ 
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Scarcity of Dorypliora 10-lineata in Colorado. 
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Habitat and food plants. 
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269. Cohn, Ferd. The Hessian fly in Silesia in 1869. <3d Kept. 
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TABLE OF CONTENTS. 
Letter to the Commissioner. 3 
Chapter I: 
Part I. 
Classification and nomenclature 
5680-3 
11 
