INDEX 



405 



Birds, albinism, 92 



— , change of habits, 54 



— , choice of food by young, 253-54 



— , choice of food in captivity, 253 



— , colour-phases, 94 



— , courtship, 151 



— , elaborate feathers, 332 



— , experiments in choice of food, 



247-49 

 — , food-habits not known in tropics, 



254 

 — , food in nature, 249-51 



— , insular forms, 137 



— , loss of flight, 365 



— , polymorphism, 282 



— , resemblance between species in 



different countries, 255-56 

 — , selective agents in evolution of 



mimicry, 252-53 

 von Bittera, specific differences in penis 



of mammals, 297 

 Blair, black variety of Cetonia, 93 

 Bland Sutton, analogy between indi- 

 vidual abnormalities and phyletic 

 characters, 331, 340 

 Blenny, Viviparous, see Z oarces 

 Blepharoceridae, adaptation to water- 

 flow, 266 

 — , correlation of mouth-parts and 



feeding habits, 300 

 — , male and female genitalia, 153 

 Blowflies, change of habits, 54 

 Bodenheimer and Klein, optimum 

 temperatures for races of Messor, 119 

 Boettger, adaptive differences in Cara- 



bus and Otala, 285 

 — , adaptive differences in Helicigona, 



288 

 — , selection in Cepea, 203-4 

 Bolk, fcetalisation in man, 365 

 Bombus, colour-convergence, 258-59 

 — , polymorphism, 102 

 — , species in Corsica resembling one in 



Himalayas, 255 

 Bombyx mori, see Silkworm 

 Bones of vertebrates, mechanical 



adaptation, 272-73 

 Borodin, age of species of Clupeids in 



Caspian Sea, 132 

 Bos bubalis, size of horns, 331 

 Boulange, genitalia isolating species, 



— , specific differences in genitalia of 



insects, 297 

 Bouvier, dimorphism in the Atyidae, 



1 1 

 Bowater, viability of melanics in 



Spilosoma, 214 

 Bower birds, display, 342 

 Boycott, colonial divergence in Clausilia, 



95 



Boycott and others, characters deter- 

 mined in extra-nuclear 

 factors, 23 



, Limnea peregra, 20 



Brachionus, non-heritable variant, 20 

 Brachiopods, age of species, 131 

 Brain, functional adaptations, 274 

 Brandt, on Baltic Macoma, 169 

 Brauer, eyes of deep-sea animals, 270 

 Breeding season, relation to isolation, 



142 

 Bridgman, estimation of frequency ot 



rare occurrences, 221 



Bristowe, grasping organs in spiders, 



294 

 — , insular spiders, 135, 139 



— , mating in Pachygnatha, 294 



— , polymorphism in Theridion, 101 



Bristowe and Locket, courtship of 



spiders, 150-51 

 , scent-production of spiders, 



293 

 Bruchus, optimum conditions, 358 

 Brues, local parthenogenesis in Hymen- 



optera, 124 

 Buarremon, restricted geographical varia- 

 tion, 106 

 Bubalis, change of habits, 54 

 — , lack of geographical races, 106 

 Bubonidae, Allen's Law, 46 

 Buller, habits of Nestor, 54 

 Bumpus, selection in Passer, 209 

 Burckhardt, race-formation in cyclic 



and acyclic Crustacea, 105 

 Burton, influence of substratum on 



sponges, 81 

 von Buttel-Reepen, temperature of 



bee-hives, 360 

 Butterflies, see Lepidoptera 

 Buxton, countershading, 342-43 

 — , desert animals, 239-40, 259 

 Byrrhidae, grooves for retraction of 

 legs, 309 



Qenogenesis, 328 



Calcium carbonate, uncontrolled pro- 

 duction, 336 

 Callimorpha, mating between races, 150 

 Caiman, on value of experimental 



methods, 32 

 ' Camouflage,' 233 

 Camptogramma, selection, 202 

 Cantharidae, leathery integument, 245 

 Capriform fishes, variation, 126 

 Carabus, adaptive differences, 285 

 — , Pleistocene compared with recent 



forms, 132 

 Carassius, example of xanthochroism, 



93 . 



— , experiments on, 41 



