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ABRAXAS grossulariata, 119.
Acanthotritus dorsalis, 94.
Accipiter pileatus, 107.
ACRÆIDÆ, the subjects of mimicry,

85, 86.
Acronycta psi, protective colouring

of, 62.
ADAPTATION brought about by gene-

ral laws, 276; looks like design,

281.
ÆGERIIDæ mimic Hymenoptera,

90.
AGASSIZ, or embryonic character of

ancient animals, 301.
Agnia fasciata, mimics another

Longicorn, 95.
Agriopis aprilina, protective colour.

ing of, 62.
ALCEDINIDÆ, sexual colouring and

nidification of, 240.
AMADINA, sexual colouring and ni-

dification of, 243.
AMPELIDÆ, sexual colouring and

nidification of, 243.
ANCYLOTHERIUM, 300.
ANDRENIDÆ, 98.
Angræcum sesquipedale, 272; its

fertilization by a large moth,

275.
Animals, senses and faculties of,

127; intellect of, compared with

that of savages, 341.
ANISOCERINÆ, 92.
ANOA, 196.

ANOPLOTHERIUM, 299..
ANTHRIBIDÆ, mimicry of, 94; di-

morphism in, 155.
Anthrocera filipendule, 120.
ANTHROPOLOGISTS, wide difference

of opinion among, as to origin
of human races, 304; conflict-

ing views of, harmonized, 321.
ANTIQUITY of man, 303, 322.
APAThus, 98.
APPARENT exceptions to law of co-

lour and nidification, 253.
AQUATIC birds, why abundant, 32.
Araschnia prorsa, 154.
ARCHEGOSAURUS, 300.
ARCHÆOPTERYX, 300.
ARCHITECTURE of most nations-de-

rivative, 228; Grecian, false in

principle, 226.
Arctic animals, white colour of,

50, 51.
Argyll, Duke of, on colours of

Woodcock, 53; on mind in na-
ture, 265; criticism on Darwin's
works, 269; on humming birds

282; on creation by birth, 287.
Asilus, 97.
ASPECTS of nature as influencing

man's development, 317.

BABIRUSA, 196.
BALANCE in nature, 42.
BARRINGTON, Hon. Daines, on song

of birds, 220.

BASILORNIS, 196.
BATES, Mr., first adopted the word

“mimicry," 75; his observations
on Leptalis and Heliconidæ, 82;
his paper explaining the theory
of mimicry, 83; objections to
his theory, 108; on variation,
165; on recent immigration of

Amazonian Indians, 214.
Bayma, Mr., on “Molecular Me-

chanics,” 363, 364.
Beauty in nature, 282; not uni-

versal, 284; of flowers useful to
them, 285; not given for its own

sake, 285.
Birds, possible rapid increase of,

29; numbers that die annually,
30; mimicry among, 103; dull
colour of females, 114; nidi-
fication as affecting colour of
females, 116; refusing the
gooseberry caterpillar, 119; the
highest in rank and organiza-
tion, 137; dimorphism in, 155;
why peculiar nest built by each
species, 215-219; build more per
fect nests as they grow older,
224, 227; alter and improve
their nests, 226; sexual differ-

ences of colour in, 239.
Bombus hortorum, 90.
Bombycilla garrula, colours and

nidification of, 255.
BOMBYLIUS, 98.
Brain of the savage but slightly

less than that of civilized man,
336; size of, an important ele-
ment of mental power, 335; of
savage races larger than their
needs require, 338, 343; of man

and of anthropoid apes com-

pared, 338.
Broca, Professor Paul, on the fine

crania of the cave men, 337.
Bryophila glandifera and B. perla

protectively coloured, 63.
BUCEROTIDÆ, sexual colouring and

nidification of, 241.
BUCCONIDÆ, sexual colouring and

nidification of, 241.
BUFF-TIP moth, resembles a broken

stick, 62.
Buildings of various races do not

change, 213.
BUPRESTIDÆ, resembling bird's

dung, 57; similar colours in

two sexes, 114.
BUTTERFLIES, value of, in studying

“natural selection," 131 ; varie-
ties of, in Sardinia and Isle of
Man, 178.

CACIA anthriboides. 94.
Callizona acesta, protective colour.

ing of, 59.
CALORNIS, 239.
CAPITONIDÆ, sexual colouring and

nidification of, 241.
Capnolymma stygium, 94.
CARABIDÆ, special protection

among, 72; similar colouring

of two sexes, 114.
Casside, resemble dew drops, 58.
CATERPILLARS, mimicking a poi-

sonous snake, 99; gaudy co-
lours of, 117; various modes of
protection of, 118; gooseberry
caterpillar, 119; Mr. Jenner
Weir's observations on, 119;
Mr. A. G. Butler's observations
o n, 121.

CELEBES, local modifications of

form in, 170; probable cause of
theso, 176; remarkable zoolo-

gical peculiarities of, 195-199.
CENTROPUS, sexual colouring and

nidification of, 242.
Cephalodonta spinipes, 92.
Ceroxylus laceratus, imitates a

moss-covered stick, 64.
CERTHIOLA, sexual colouring and

nidification of, 244.
Cethosia æole, 172; biblis, 172.
CETONIADÆ, how protected, 73;

similar colours of two sexes,

114.
CBYCOPSIS, 196.
Charis melipona, 96.
CHEMATOBIA, wintry colours of this

genus, 62.
Chlamys pilula, resembles dung of

caterpillars, 58.
Curysididæ, how protected, 72.
CHRYSOMELIDÆ, similar colouring

of two sexes, 114.
CICINDELA, adaptive colour of va-

rious species of, 57.
Cilix compressa, resembles bird's

dung, 63.
CLADOBATES, mimicking squirrels,

COLOUR, in animals, popular theo-

ries of, 47; frequent variations
of, in domesticated animals, 48;
influenced by need of conceal-
ment, 49; in deserts, 49, 50;
in Arctic regions, 50, 51; noc-
turnal, 51 ; tropical, 52; special
modifications of, 52; different
distribution of, in butterflies
and moths, 58; of autumnal
and winter moths, 62; white,
generally dangerous and there-
fore eliminated, 66; why it
exists so abundantly although
often injurious, 69; influenced
by need of protection, 113; of
female birds, 114; in relation to
nidification of birds, 116; gaudy
colours of many caterpillars,
117; in nature, general causes
of, 126; local variations of,
173; sexual differences of, in
birds, 239; in female birds, how
connected with their nidifica-
tion, 240, 246; more variable
than structure or habits, and
therefore more easily modified,
249; of flowers, as explained by
Mr. Darwin, 262; often corre-

lated with disease, 316.
COMPSOGNATHUS, 300.
Condylodera tricondyloides, 97.
ConsCIOUSNESS, origin of, 360;

Professor Tyndall on, 361; not
a product of complex organiza-

tion, 365.
CORRELATION of growth, 310.
Ccrynomalus sp., 92.
COTINGIDÆ, sexual colouring and

nidification of, 244.
CRATOSOMUS, a hard weovil, 94. .

107.

CLASSIFICATION, form of true, 6;

circular, inadmissible, 8; quina-
rian and circular, of Swainson,
46; argument from, against
Mr. Darwin, 295.
CLIMACTERIS, sexual colouring and

nidification of, 243.
COCCINELLIDÆ, how protected, 72;

similar colouring of sexes, 114.
Coexisting varieties, 159.
Collyrodes lacordairei, 95.

CRICKETS mimicking sand wasps,

98.
CRYPTODONTIA, 299.
Cucullia verbasci, 120.
CurcuLIONIDÆ, often protected by

hard covering, 71; similar co-

lours of two sexes, 114.
Cuviera squamata, 258.
Cyclopeplus batesii, 92.
CYNOPITHECUS, 196.
Cynthia arsinoë, 172.

DOMESTICATED animals, their essen-

tial difference from wild ones,

38-41.
DOTTERELL, 251.
Drusilla, mimicked by three ge-

nera, 181.
Drusilla bioculata, 180.
Dytiscus, dimorphism in, 155.

DANAIDÆ, the subjects of mimi

cry, 85, 86.
Danais erippus, 88; chrysippus,

112; sobrina, 179; aglaia, 179;

tytia, 180.
Darwin, Mr., his principle of uti-

lity, 47; on cause of colour in
flowers, 127, 262; on colours of
caterpillars, 118; on sexual co-
louration, 260; his metaphors
liable to misconception, 269;
criticism of, in North British

Review, 291.
DESERT animals, colours of, 49, 50.
DIADEMA, species of, mimic Danai-

dæ, 86, 87: female with male

colouration, 112.
Diadema misippus, 112; D. ano-

mala, 113.
Diaphora mendica, 89.
DICNYODONTIA, 299.
DICROURUS, 253.
Diloba cæruleocephala, 120.
DIMORPHISM, 145; in beetles, 155;

in birds, 155; illustrated, 157.
DINOSAURIA, 298.
DIPTERA mimicking wasps and

bees, 97.
Doliops curculionides, 94.

EGYPTIAN architecture, intro-

duced, 225.
Elaps fulvius, E. corallinus, E. lem-

niscatus, 101; E, mipartitus, E.

lemniscatus, E. hemiprichii, 102.
ENODES, 196.
ENNOMUS, autumnal colours of this

genus, 62.
Eos fuscata, dimorphism of, 155.
Equus, 299.
Eronia tritæa, 172; valeria, 172.
Eroschema poweri, 93.
ERYCINIDÆ mimic Heliconidæ, 84.
Erythroplatis corallifer, 92.
ESTRELDA, sexual colouring and

nidification of, 243.
EUCNEMIDE, mimicking a Malaco-

derm, 93.
Eudromias morinellus, 251.
Euglossa dimidiata, 98.
EUMORPHIDÆ, a protected group,

72; imitated by Longicorns, 92.
EuPlea, local modifications of co-

lour in, 173.
Euplæa midamus, 87–113, 179 ;

E. rhadamanthus, 87, 179.
Eurhinia megalonice, 172; poly-

nice, 172.
EURYLÆMIDÆ, sexual colouring and

nidification of, 243.
Extinct animals, intermediate

forms of, 298.

Extinction of lower races, 318.

FEMALE birds, colours of, 114;

sometimes connected with their
mode of nidification, 240; more
exposed to enemies than the
males, 248,
FEMALE butterflies generally dull-

coloured, 259.
Female insects, mimicry by, 110,

259; colours of, 113.
FEMALE sex, has no incapacity for

as brilliant colouration as the
male, 247; in some groups re-
quires more protection than the

male, 258.
Fishes, protective colouring of, 55.
FISSIROSTRAL birds, nests of, 238.
Flowers, causes of colour in, 127.
FLYCATCHERS, genera of, absent

from Celebes, 177.
FORBES, EDWARD, objections to his

theory of Polarity, 17-23.
Force is probably all Will-force,

366.

GEOLOGY, facts proved by, 2-5.
Giraffe, how it acquired its long

neck, 42.
Glæn, autumnal colours of this

genus, 62.
Gould, Mr., on sexual plumage of

Gray Phalarope, 115; on incu-

bation by male Dotterell, 115.
Grallina australis, 254.
GREEN birds almost confined to

the tropics, 52.
Gymnocerus cratosomoides, 94.
Gymnocerous capucinus, 96.
Gymnocerous dulcissimus, 97.
GUNTHER, Dr., on arboreal snakes,

55; on colouring of snakes, 102.
Gynecia dirce, 59.

GALÁPAGOS, 10.
Galton, Mr., on range of intellec-

tual power, 339.
GANOCEPHALA, 298.
Gastropacha querci, protective co-

lour and form of, 62.
Gaudry, M., on fossil mammals of

Greece, 299.
GEOGRAPHICAL distribution, de-

pendent on geologic changes, 1;
its agreement with law of in-
troduction of new species, 9;

of allied species and groups, 12.
GEOLOGICAL distribution analogous

to geographical, 13.

HABITS, often persistent when

use of them has ceased, 234; of
children and savages analogous
to those of animals, 235; if
persistent and imitative may be

termed hereditary, 235, 236.
Hairy covering of Mammalia, use

of, 344; absence of, in man re-
markable, 345; the want of it
felt by savages, 346; could not
have been abolished by natural

selection, 348.
Harpagus diodon, 107.
HeiliPlus, a hard genus of Cur-

culionidæ, 94.
IIELICONIDÆ, the objects of mimi-

cry, 77 ; their secretions, 88;
not attack d by birds, 79; some-
times mimicked by other Heli-

conidæ, 85.
HELLADOTHERIUM, 300.
HEMIPTERA, protected by bad

odour, 72.

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