Coccinella novemnotata as enemy of Pea- or 
Clover- louse, 73. 
dates of emergence of, as a beetle, 74. 
parasite of, 74. 
sanguinea as enemy of Pea- or Clover- louse, 
73. 
date of emergence of, as a beetle, 74. 
Coccinellidse as enemies of Pea- or Clover- 
louse, 73-75. 
dates of emergence of adult, 74. 
food of, 74. 
predaceous enemy of, 74, 75, SO. 
Coccus trifolii, 117. 
Cockerel!, T. D. A., 121. 
Collops quadrimaculatus, larva of, as parasite 
of eggs of Clover Leaf-weevil, 90. 
Colorado Potato-beetle, eggs of. eaten by Megil- 
la maculata. 74. 
Common Flower-bug as enemy nf Clover Seed- 
midge, 51. 
Composite as food plants of Clover Stem-borer, 
107. 
Comstock, T. IT., 50, 62, 63, 64. 65. 09. 100, 
102, 107, 108, 111. 
Coneflower as food plant of C'over Stem-borer, 
107. 
confluens, CEcanthus, 73, 79. 
Con Sol, effect of, on germination of seed-corn 
tested, 11. 
convergens, Hippodamia, 73. 
Copper sulphate, effect of, on germination of 
seed-corn tested, 11. 
Corn-Field Ant. abundance nnd distribution of, 
27. 
adaptation of beha\ior of, to changing 
conditions in field, 36 37. 
and Corn Root-aphis, imiiortnncc of con- 
trol of, 1. 
single field experiment with repel- 
lents for, inconclusive, 22. 
area occupied by single colony of, 33. 
beginning of a new colony of, 28-30. 
behavior of, within the nest, 34-36. 
contents of nests of, 27-28. 
effect on, of change of crop from Corn 
to Oats, 38-40. 
eggs and young of Corn Root-aphis 
destroyed by, 32, 36. 
food of, emergency and ordinary. 36-37. 
injury to Corn by, 37-38. 
insignificance of males in life of colony 
of, 35. 
intercolonial hostilities of, 31 M. 
utility of, 32-33. 
Lasius niger americanus, habits and be- 
havior of the, 27-40. 
nursing instinct of workers of, illus- 
trated, 35-36. 
relations of, to other species of ants, 34. 
size of colonies of, 30-31. 
Corn-Field Ant — Continued. 
special tests of reaction of, to various 
repellents, 22-23. 
experimental, description of experiment in, 
for practical test of effect of repel- 
lents against Corn Root-aphis and 
Corn-Field Ant, 13-21. 
for practical test of effect of repellents 
against Corn Root-aphis and its at- 
tendant ant, 13-21. 
general final result of above test in. 21. 
insect infestation of, at time of plowing 
for Corn, 14. 
minor additional test in, with various 
repellents on seed-corn, 22-23. 
repellents used in above experiment- in, 
14. 
results of treatment of seed-corn evi- 
dent in, at first and second inspec- 
tions, 16-19. 
of same evident in, at third inspection. 
19. 
of same evident in, at fourth insoec- 
tion, 19-21. 
injury to. by Corn-Field Ant. 37-38. 
Root-aphis, 38. 
experiments with repellents against. 1905 
and 1906, 1-26. 
general program for prevention of in'ury 
by, 24-26. 
kerosene applied to seed-corn as measure 
against, 2. 
natural check on, 1. 
power of multiplication of, 1. 
repellents against, tested to determine ef- 
fect on germination of seed corn, 
3-13: 
alcohols, 9, 13. 
Calcothion, 11. 
camphor, 11. 
carbolic acid, 9, 13. 
carbon bisulphid, 11. 
coal-tar, 11. 
-water. See tar-water. 
Con Sol, 11. 
copper sulphate, 11. 
crude petroleum, 8, 12. 
formalin, 9, 13. 
Fruitolin, 11. 
iron sulphate. 11. 
kainit, 10. 
kerosene, 2, 4, 6, 7, 12. 
emulsion, 4, 6. 
lime, 10. 
and sulphur, 10. 
chloride of, 10. 
sulphur, and blue vitriol, 10. 
and salt, 10. 
lysol, 9, 13. 
musk, 11. 
mustard, 11. 
