Part 60

Blond ring-dove, 110

Blue flag, fruiting, 142

Bluebird, 117

Bluejay, 117

Bohn’s studies in animal behavior, 107

Boll worm, report on, 77

Bombus, behavior, 120 see also Humble-bee

Borers, wood, 77

Brackish waters of Lower Elbe, fauna, 138

Breeding habits, bark beetles, 76 birds, of North America, 109 crawfish, 108 horned dace, 63 snout beetles, 76

Bufo lentiginosus americanus Le Conte, 100

Bumble-bee, see Bombus see also Humble-bee

Burrowing bee, 134

Butterflies, biology, 118 drinking habits, 119 food plants, 77

Cactus, Arizona, insect fauna, 135

Cactus, giant, and its insect fauna, 135 insects, 135

Caithness, vegetation, 88

Caledonia Creek, N. Y., insects and animal forms, 147, 148

Cambarus, 113

Cambarus affinis, habit formation, 106

Camp cooking, 62

Camping, 57, 60, 61, 65

Capitalization, 69

Carabidæ, early stages, 73 food relations, 127

Carbohydrates, effect on resistance to lack of oxygen, 99

Carbonic acid, reaction of fish to, 118

Card-index system for records, 64

Carrion-feeding insects, 146