TABLES OF CONTENTS. 



Neither of the first five volumes contained a table of contents, tbe plan 

 of giving such having been adopted with the sixth. Most of these 

 tables are, therefore, prepared for this Bulletin, while those of the 

 Sixth and Seventh Reports are amplified. Those of the last two 

 volumes are reproduced as they were originally made. 



REPORT I. 



[Submitted December 2, 1808; published March, 1869.1 



Page. 



Introductory , ' 



NOXIOUS INSECTS. 



The Bark-lice of the Apple-tree 



Two species known to occur in the United States, 7 Harris's Bark-louse 



not numerous enough to do material damage, 7. 

 THE OYSTER-SHELL BARK-LOUSE* 



Difference in the scales of the two species, 7 Introduction of the Oyster- 

 shell Bark-louse from Europe and its spread in the United States, 8 

 Precautionary measures to prevent its introduction into Missouri, 8 

 Its habits studied by different observers in 1867, 9 Seasonal notes 

 on the development of the insect, 10 Only one annual brood in Mis- 

 souri, 12 Formation and nature of the scale, 12 Rare occurrence of 

 males, 14 Difference of opinion among observers as' to the mode of 

 growth of the scale, 14 Difficulty of explaining the spread of the 

 insect from one tree to another, 15 Its occurrence upon other kinds of 

 trees, 15 Natural enemies, Iti Artificial remedies, 16 Examination 

 of young trees before planting, 16 Washing with alkalies, etc., 17- 

 Scrubb'mg the branches with a stiff brush, 17 Fumigating. 17 Ap- 

 plication of sheep-manure, 17 Washes in general ineffective, 17 The 

 insect can most successfully be fought during three or four days of the 

 year only, 18. 



The Periodical Cicada 18 



Its singular life history, 18 Seventeen and thirteen year races, 19 

 The two races not distinct species, 19 Two distinct forms occurring 

 in both broods, 20 Season of their appearance and disappearance, 

 22 Natural history and transformations, 22 Elevated chambers of the 

 pupa, 22 Thelarvse frequently occurring at great depth in the ground, 

 24 The operation of emerging from the pupa, 24 Only the males are- 

 capable of singing, 24 Trees in which the females deposit their eggs, 24 

 Mode of ovipositiori, 24 The newly hatched larva, 25 The W on 

 the wings of the Cicada, 25 Enemies, 26 Fungus infesting the imago, 

 26 The sting of the Cicada, 26 Wide-spread fear of the insect on ac- 



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