INDEX 



Alcock, Colonel, on courtship of 



crabs, 255 

 Alder-flies, claspers of, 233 

 Amorousness, a factor in evolu- 

 tion, 24 



— power of, 6, 9 



— where absent, 6 

 Andrews, Dr. C. W., on display 



of Frigate-bird, 1 1 1 

 Antelopes, battles of, 64 



— horns of, 63 



— scent glands of, 67 

 Antennae, sense of smell in, 199 

 Antlers, branching of, 61 



— eaten when shed, 58 



— in female deer, 62 



— shedding of, 53 



— types of, 60 



— use of, 5 s 



Ants, nuptial flight of, 297 



— dismal fate of queen, 298 

 Apes, brilliant colours of, 45 

 use of, 46 



— family relations of, 43 



— polygamy in, 48 



— power of voice in, 42 



— related to man, 41 

 Aphides, appalling fertility of, 



301 



— parthenogenesis in, 301 

 Argonaut, remarkable egg-cradle 



of, 269 



Armature in birds, 117 



Argus Pheasant, display of, 96 



ocelli of, 97 



Baboons, mane of, 44 

 Bailador, dances of, 121 

 Barrett Hamilton, Major, on 



Fur-seals, 85 

 Bee, Bumble, life of, 292 



— drone, life of, 281, 289 



— queen, as executioner, 279 



execution of, 286 



nuptial flight of, 279 



— worker, evolution of, 290 

 Beetles, fighting between, 214 



— stridulating organ of, 217 



— vivid coloration in, 209 



" Behaviour," specific character 



of. 157 



Birds, secondary sexual char- 

 acters of, 94 



Birds-of-Paradise, display of, 



lOI 



Bower-birds, coloration of, 158 



origin of " bowers," 160 



singular behaviour of, 157 



Brine-shrimp, vitality of, 304 

 Bug, extraordinary armature of, 



216 

 Bustard, AustraUan, display of, 



108 



