Part 71

Horde, 132

Human associations, 11

Human behavior, biological and psychological foundations, 133

Humble-bee, domestication, 119 habits, 119 life history, 119

Humidity of air, vegetational control of relative, 90

Humus, effect on animal life of soil, 100

Huttonian theory, 80

Hydroides Dianthus V., behavior modifiable, 106

Hydropsyche, photographing nets of, 64

Hymenoptera of N. America, bibliography, 73 catalogue of species, 73

Hypermetamorphic beetles, 139

Hypotheses, multiple working, 55

Ideas, biometric, 63 life history of scientific, 57

Illinois, ecological relations of entomophilous flora and anthophilous insect fauna, 142 fish, 140 sand areas, biology, 146 sand prairies, associational study, 139 State Entomologist’s reports, 74

Illinois River, entomology, 74 plankton, 147

Image-forming powers of eyes of various types, 110

Imitation, and intelligence in birds, 117 criterion, 117

Index, Agricultural reports of the U. S. patent office, 72 circulars, U. S. Entomology Bureau, 73 Experiment Station Record, 76 Illinois State entomologist’s reports,74 Insect Life, 72 Lintner’s New York State entomologist’s reports, 74 Missouri reports on insects, 77 Ontario entomological society reports, 72 Orthoptera of North America, 77 papers on biological survey of U. S., 128 Riley’s Missouri entomological reports, 77

Index catalogue of medical and veterinary zoölogy, 129

Indian corn, see Corn

Indiana, caves and their fauna, 144 insect galls, 143

Individual development, 97

Individual ecology, 3, 8, 23, 24 and the associational unit, 131

Influence, of sessile habit, 100 of slowest factors, 98

Inland habitats, 91

Insect associations, changes in, 127

Insect depredations in forests, 127

Insect enemies of cotton boll weevil, 125