TABLE OF CONTENTS TO REPORT VI. 35 



Page. 



Insects injurious to the Grape-vine Continued. 

 THE GRAPE PHYLLOXERA. 



true sexual individuals and the winter egg of Phylloxera quercits, 41 - 

 The winter egg uot essential to the winter life of the Grape Phylloxera, 

 42 Polymorphism in Phylloxera, 43 Conclusive proof of the identity 

 of the root- and gall-lice, 44 Practical considerations, 44 The more 

 manifest and external effects of the disease, 44 Mode of spreading, 

 45 Swarming of winged specimens of Phylloxera carya'foliw, 45 

 Power of flight in the Grape Phylloxera, 45 Spread of the disease 

 through the winged females, 46 Susceptibility of different vines to 

 the disease, 46 Practical importance of knowing the more resisting 

 and more susceptible vines, 46 List of the cultivated species and va- 

 rieties of vines indicating their relative susceptibility to Phylloxera, 

 47 Prophylactic means of coping with the disease, 48 Grafting the 

 more susceptible onto the roots of resisting vines, 48 Other preventive 

 measures, 50 Natural enemies, 50 Insect enemies of the gall-louse, 

 50 Enemies of the root-louse, 52 The Phylloxera mite, 52 Different 

 forms assumed by mites in their development, 52 Hoplophora arctata f 

 53 Peculiarities of the Oribatidw, 54 Direct remedies, 55 Submer- 

 sion a perfect remedy, 55 Application of pure insecticides without sat- 

 isfactory results, 56 Range of the insect in America, 57 Injury 

 caused by it in America, 58 Reasons why the insect is more injurious 

 in Europe, 59 False theories, 60 The Phylloxera is the cause and not 

 the effect of the disease, 60 It is a native American insect and has been 

 imported into Europe, 62 It is peculiar to the Grape-vine, 63 The 

 American Oak Phylloxera and its natural history, 64 Conclusion, 65. 



APPENDIX AND NOTES TO THE ARTICLE ON GRAPE PHYLLOXERA 66 



Diagnosis of Phylloxera rastatrix, 66 Influence of the insect's puncture, 

 67 The supposed male of the gall-louse, 67 The non-cultivation of 

 the Clinton grape, 67 Transient nature of the leaf-galls, 68 Con- 

 stancy of the differences between the forms assumed by the insect, 68 

 Supposed sexual individuals, 68 Number of generations annually 

 produced, 69 Number of molts, 69 Transplanting root-lice onto the 

 leaves, 69 Nature of the swelling on the roots produced by Phylloxera, 

 70 The true Grape-vines of the United States, by Dr. G. Engelmaun, 

 70 Exceptional instances where the European Vine has succeeded in 

 America, 76 Grafting the more susceptible onto the roots of the re- 

 sisting varieties, 78 Descriptions of Tyroglyphns phylloxeras and Ho- 

 plophora arctata, 81 Efficacy of inundating the vineyards, 82 Facts 

 showing that the disease of Grape-vines in America is principally 

 caused by Phylloxera, 82: Description of Phylloxera rileyi,86 The 

 true sexual individuals and the winter egg, 86. 

 THE BLUE CATERPILLARS OF THE VINE 87 



1. The Grape-vine Epimeuis, 87 Habits and characters of the larva, 

 87 Description of larva and chrysalis, 88. 



2. The Beautiful Wood Nymph, 88 Characters and food plants of the 

 larva, 88 The moth and the egg, 89 Description of the egg and larva, 

 89 Of the chrysalis, 90. 



3. The Pearl Wood Nymph, 90 Its larva almost undistinguishable from 

 that of the foregoing species, 90 Food-plant, 91 Distinguishing char- 

 acters of the moth, 91 Mr. Liutuer's description of the larva, 92 Mr. 

 Liutuer on the difference between the larva of Eudnjas grata and E. 

 unio, 93. 



4. The Eight-spotted Forester, 94 Description of the larva, 04 ; Chrys- 

 alis and imago, 95. 



