TABLE OF CONTENTS TO REPORT VII. 39 



Pa ge. 

 Canker Worms 80 



Confusion regarding the two species of Canker Worms, 80 Distinguish- 

 ing characters of the Spring Canker- worm, 80 Description of egg, 

 larva and chrysalis of Anisopleryx vernata, 82 How the Fall Canker- 

 worm differs from the preceding, 83 Description of egg, larva, and 

 chrysalis of Anisopteryx pometaria, 84 Practical importance of distin- 

 guishing the two species, 85 Comparative description of the Spring and 

 Fall Canker-worms, 86 Conclusion, 88 Extracts from the original 

 essay on the Canker Worm by "W. D. Peck, 89. 

 T.ie Grape Phylloxera 90 



Completion of its natural history, 90 The true sexual individuals dis- 

 covered, 91 Epitome of the life-history of the Grape Phylloxera, 91 

 Different forms presented by the species, 93 Its power to change its 

 habit, 93 Specific identity of the gall- and root-louse, 94 Untrust- 

 worthy experiments made by the Department of Agriculture, 95 

 Proof of the identity of the two forms, 95 The gall-louse is but a 

 transient form, 96 Where do the winged females lay their eggs ? 96 

 The winged ^female lays the egg wherever she is carried by the wiud, 

 97 Particular part of the vine chosen by the winged female for laying 

 her eggs, 98 The true sexual individuals, 98 Injury done by Phyllox- 

 era in America during the year 1874, 99 Range of the insect, in Amer- 

 ica, 101 Does it occur in South Carolina and Georgia? 102 The 

 Phylloxera in California, 103 Injury done during the year 1874 in 

 France, 103 Its spread in Europe, 104 Direct remedies, 105 Nat- 

 ural enemies, 106 Susceptibility of different varieties of grape-vine, 

 103 Grafting as a means of counteracting the work of Phylloxera, 

 108 Underground grafting, 109 Methods of grafting above ground, 

 112 Roots to use as stock, 115 Varieties to graft, 116 American 

 grape-vines abroad, 116. 

 APPENDIX TO THE ARTICLE ox GRAPE PHYLLOXERA 117 



Synopsis of the American species of the genus Phylloxera, 117 The 

 American Oak Phylloxera, 118; Its natural history, 119 Description 

 of Phylloxera rileyi and the different forms presented by it, 119 Fur- 

 ther points in its life-history, 120. 

 The Rocky Mountain Locust 121 



Its natural history, 121 Method of egg-laying, 121 The egg, 122 

 The newly-hatched locust and its development, 122 Where the eggs 

 are laid by preference, 123 The invading swarms are formed by a sin- 

 gle species, 124 Differences between the Rocky Mountain and the Red- 

 legged Locusts, 125 Mr. Thomas's description of the Red-legged Lo- 

 cust, 126 Variations, 126 Measurements of Caloptenus femur-ruhrum, 

 127 Description of Caloptenus spretus and of its larva and pupa, 129 

 Measurements of Caloptenus spretus, 130 Summiug up the difference 

 between the two species, 132 Chronological history, 132 Locust in- 

 vasions in the Old World, 132 Accounts of earlier locust invasions in 

 America, 133 Chronological history of the Rocky Mountain Locust, 

 134 Earlier invasions, 135 Data regarding the invasion of 1867, 

 137 The invasion of 1873, 141 The invasion of 1874, 143 The in- 

 f, vasion of 1874 in Missouri, 144 Questions addressed to correspondents 

 in each county in Missouri regarding the locust, 144 Summary of 

 the answers given by correspondents, 145 The invasion of 1874 in 

 Kansas, 148 iu Nebraska, 151 in Iowa and Minnesota, 153 in Colo- 

 rado, 154 in Dakota and Manitoba, 155 Flight and ravages of a 

 locust swarm, 156 Food plants, 158 Time of appearance of invading 



