BIBLIOGRAPHY OF ECONOMIC ENTOMOLOGY. 175 
1363. Riley, C. V.—Continued. 
Insects injurious to the grape-vine . 30 
The grape Phylloxera, Phylloxera vastatrix . 30 
The term “Phylloxera,” 30—Bibliographical history, 30—Charac¬ 
ters of the genus and its position in the system, 33—Biological 
history, 33—Different forms which the insect assumes, 33—The 
gall-inhabiting form, 34—The root-inhabiting form, 38—Balbi- 
ani’s discovery of the true sexual individuals and the winter egg 
of Phylloxera qnercus, 41—The winter egg not essential to the 
winter life of the grape Phylloxera, 42—Polymorphism in Phyl¬ 
loxera, 43—Conclusive proof of the identity of the root- and gall- 
lice, 44—Practical considerations, 44—The more manifest and ex¬ 
ternal effects of the disease, 44—Mode of spreading, 45—Swarm¬ 
ing of winged specimens of Phylloxera caryoefolice, 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 varieties of vines indicating their relative susceptibility to 
Phylloxera, 47—Prophylactic means of coping with the disease, 
48—Grafting the more susceptible on to 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— Eoplophora arctata, 53—Peculiarities 
of the Oribatulce, 54—Direct remedies, 55—Submersion a perfect 
remedy, 55—Application of pure insecticides without satisfactory 
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 vastatrix, 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—Constancy 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 on to the leaves, 69—Nature of the 
swelling on the roots produced by Phylloxera, 70—The tiue 
grape-vines of the United States, by Dr. G. Engelmann, 70— 
Exceptional instances where the European vine has succeeded 
in America, 76—Grafting the more susceptible on to the roots of 
the resisting varieties, 78—Descriptions of Tyroglyphm phylloxera; 
and Eoplophora arctata, 81—Efficacy of inundating the viueyards, 
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 Epimenis, Psychomorpha epimenis, 87—Habits aud 
charactersof the larva, 87—Description oflarva and chrysalis, 88. 
2. The beautiful wood nymph, Eudryas grata, 88—Characters aud 
food-plants of the larva, 88—The moth and the egg, 89—Desorip* 
tiow of tho egg aud larva, Qf tbe cliryealia, 90, 
