478 
INDEX 
Belt, Mr., on leaf-cutting ants, 283 
on an Acacia inhabited by ants, 
285 
on uses of ants to the trees they 
live on, 285 
on a leaf-like locust, 288 
on tree-frogs, 305 
on the habits of humming-birds, 
319 
on uneatable bright-coloured frog, 
351 
on use of light of glow-worm, 374 
Berthoud, on stone implements in 
tertiary deposits in America, 448 
Betel-nut, 252 
Bill of humming-birds, 315 
Birds, possible rapid increase of, 28 
numbers that die annually, 24 
mimicry among, 73 
dull colour of females, 80 
nidification as affecting colour of 
females, 81 
refusing the gooseberry cater- 
pillar, 84 
why peculiar nest built by each 
species, 101, 103 
build more perfect nests as they 
grow older, 108 
on instincts of newly-hatched, 109 
alter and improve their nests, 114 
sexual differences of colour in, 123 
tropical orders of, 292 
how many known, 312 
influence of locality on colours 
of, 382 
cases of local variation of colour 
among, 387 
Bombus hortorum, 64 
Bombycilla garrula, colours and 
nidification of, 184 
Bombylius, 69 
Bonelli, Mr., on the Sappho comet 
humming-bird, 318 
Brain of the savage but slightly less 
than that of civilised man, 188 
size of, an important element of 
mental power, 188 
of savage races larger than their 
needs require, 190, 193 
of man and of anthropoid apes 
compared, 190 
Broca, Professor Paul, on the fine 
crania of the cave men, 189 
Bryophila glandifera and B. perla pro- 
tectively coloured, 46 
Bucerotide, sexual colouring and 
nidification of, 125 
Bucconide, sexual colouring and 
nidification of, 125 
Buff-tip moth, resembles a broken 
stick, 45 
Buildings of various races do not 
‘change, 99 
Bullock on food of humming-birds, 
320 
Buprestide, resembling bird’s dung, 
42 
similar colours in two sexes, 80 
in tropical forests, 289 
Burchell, Dr., on the “stone mesem- 
bryanthemum,” 396 
Butterflies, abundance of, in tropical 
forests, 272 
conspicuousness in tropical forests, 
2 
colours and form of, 273 
peculiar habits of tropical, 275 
tropical and temperate compared 
as to colour, 342 
females do not choose their part- 
ners, 370 
with gaily coloured females, 373 
influence of locality on colours of, 
382 
Buttressed trees, 241 
Cacta anthriboides, 67 
Celogynes, 257 
Calamus, 249 
Calaveras skull found in auriferous 
gravel, 447 
California, auriferous gravels of, 442 
Callithea, imitated by species of Cata- 
gramma and Agrias, 383 
Callithea markii, 274 
Callizona acesta, protective colouring 
of, 48 
Calornis, 123 
Campylopterus hemileucurus 
nacious and ornamental, 380 ; 
Capitonide, sexual colouring and 
nidification of, 125 
Capnolymma stygium, 67 
ar special protection among, 
2 
pug- 
similar colouring of two sexes, 80 
