INDEX 



155 



Bionomy, marine, and stratigraphy, 



22 



Biota, postglacial dispersal, 91 

 Biotic associations, 29, 91 



sand areas, 146 



sandy flats of seacoast, 136, 137 

 Biotic base, 30 

 Biotic community, 141 

 Biotic competition in tropics, 124 

 Biotic succession in media, 88 

 Bird census, sectional, 59 

 Bird habitats of Bismarck Archi- 

 pelago, 137 

 Birds, 



adaptations by insects to, 125 



and man, 130 



associational studies, 146 



behavior, 121 



breeding habits of North Ameri- 

 can, 109 



collecting, 58 



colonies, 120 



decrease, 124 



destruction by elements, 124 



ecological succession, 21, 124, 133 



economic value, 123, 126 



eggs of North American, 109 



food, 126, 128, 130 



food of nestling, 128 



habitat groups, 145, 146 



habitat preferences, 148 



habitats in summer, 146 



instinct, 113 



intelligence, 113 



life histories of North American, 

 109 



methods of study, 39, 60, 61 



migration, 109 



migration as a response, 109 



noxious, introduction, 124 



of a Maryland farm, 125 



of Isle Royale, ecological distri- 

 bution of, 148 



photographing, 59, 61 



protecting woodlands, 124 



protection, 124 



protection of useful, 127 



quantitative study, 59, 60 



regulative action upon insect 

 oscillations, 123 



statistical study, 59, 60 



stomach contents, estimating, 62 



study 39, 60, 61 

 Birds' eggs, collecting, 58 

 Birds' nests, collecting, 58 

 Bismarck Archipelago, bird habi- 

 tats, 137 

 Black bass as a microcosmic center, 



49 

 Blind species of cave fauna, origin, 



144 



Blissus leucopterus Say, 20 

 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 americanits 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 



