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ABRAXAS grossulariata, 119.
Aoanthotritus dorsalis, 94.
Accipitcr pileatus, 107.

Acr.eid.e, the subjects of mimicry,
85, 86.

Acrom/cta psi, protective colouring
of, 62.

Adaptation brought about by gene-
ral laws, 276; looks like design,
281.

MamamM mimic Hymenoptera,
90.

Agassiz, or embryonic character of
ancient animals, 301.

Agnia fasciata, mimics another
Longicorn, 95.

Agriopis aprilina, protective colour-
ing of, 62.

Alcedinid.e, sexual colouring and
nidification of, 240.

Amadina, sexual colouring and ni-
dification of, 243.

Ampelid.e, sexual colouring and
nidification of, 243.

Axcylotherium, 300.

Andrenid.e, 98.

Angroecttm sesquipedale, 272; its
fertilization by a large moth,
275.

Animals, senses and faculties of,
127 ; intellect of, compared with
that of savages, 341.

Anisocerin-e, 92.

Anoa, 196.

Anoplotherium, 299.

Anthribid.e, mimicry of, 94; di-
morphism in, 155.

Anthrocera filipendttla, 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.

Arch.eopteryx, 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.

BABIRTTSA, 196.
Balance in nature, 42.
Barrington, Hon. Daines, on song
of birds, 220.

Basilorms, 196.

Bates, Mr., first adopted the word
"mimicry," 75; his observations
on Leptalis and Heliconicta, 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 hortarum, 90.

Bombjcila 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, Trofessor Paul, on the fine
crania of the cave men, 337.

Bryophila glandijera and B. perla
protectively coloured, 63.

Bucerotid.e, sexual colouring and
nidification of, 241.

Bucconid.e, sexual colouring and
nidification of, 241.

Buff-tip moth, resembles a broken
st irk, 62.

Buildings of various races do not
change, 213.

Buprestid*, 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.

Capitonid.e, sexual colouring and
nidification of, 241.

Capnolymma stt/gium, 94.

Carabidye, special protection
among, 72; similar colouring
of two sexes, 114.

Cassid.e, 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
on, 121.

Celebes, local modifications of
form in, 170; probable cause of
these, 176; remarkable zoolo-
gical peculiarities of, 195-199.

Centropus, seiual colouring and
nidification of, 242.

Cephalodonta spinipes, 92.

Ceroxylus laceratus, imitates a
moss covered stick, 64.

Certhiola, sexual colouring and
nidification of, 244.

Cethosia <zole, 172; biblis, 172.

Cetoniace, how protected, 73;
similar colours of two sexes,
114.

Ceyoopsis, 196.

Charie melipona, 96.

Chematobia, wintry colours of this
genus, 62.

Chlamys pilula, resembles dung of
caterpillars, 58.

Chrvsididje, how protected, 72.

Chrysomelid.e, similar colouring
of two sexes, 114.

Cicindela, adaptive colour of va-
rious species of, 57.

Cilix compressa, resembles bird's
dung, 63.

C'ladobates, mimicking squirrels,
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.

Coccinellidx, how protected, 72;
similar colouring of sexes, 114.

Coexisting varieties, 159.

Collyrod.es lacordairei, 95.

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 tricoiidyloides, 97.

Consciousness, origin of, 360;
Professor Tyndall on, 361; not
a product of complex organiza-
tion, 365.

Correlation of growth, 310.

Corynomaliiis sp., 92.

Cotingid.e, sexual colouring and
nidification of, 244.

Cratosomus, a hard weevil, 94.

Crickets mimicking sand wasps,
98.

CltYrTOdONTIA, 299.

Cucullia verbasci, 120.

Curculiojjidje, often protected by
hard covering, 71; similar co-
lour! of two sexes, 114.

Cuviera squamata, 258.

Cyclopeplus batesii, 92.

Cynopithecus, 196.

Cynthia arsinoe, 172.

DANAID.E, the subjects of mimi-
cry, 85, 86.

Danais crippus, 88; chrysippus,
112; sobrina, 179; aglaia, 179;
tytia, 180.

Darwix, 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-
dse, 86, 87: female with male
colouration, 112.

Diadema misippus, 112; D. ano-
mala, 113.

Diaphora mendica, 89.

Dicicyodontia, 299.

Dicrourus, 253.

Diloba coeruleocephala, 120.

Dimorphism, 145; in beetles, 155;
in birds, 155; illustrated, 157.

Dikosauria, 298.

Diptera mimicking wasps and

bees, 97.
Doliops curculionidei, 91.

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.

EGYPTIAN architecture, intro-
duced, 225.

Elapsfulvius, E. corallinus, E. lem-
niscatus, 101; E. mipartitus, E.
lemniscatus, E. hemipricKli, 102.

Enodes, 196.

Ennomus, autumnal colours of this
genus, 62.

Eos fuscata, dimorphism of, 155.

Equus, 299.

Eronia tritoea, 172; Valeria, 172.

Eroschema poweri, 93.

Ertcinidje mimic Heliconidaj, 84.

Erythroplatis corallifer, 92.

Estrelda, sexual colouring and
nidification of, 243.

Eucnemid.e, mimicking a Malaco-
derm, 93.

Eudromias morinellus, 251.

Euglossa dimidiata, 98.

Eumorphid.e, a protected group,
72; imitated by Longicorns, 92.

Euploja, local modifications of co-
lour in, 173.

Euplaia midamus, 87-113, 179;
E. rhadamanthus, 87, 179.

Eurhinia megalonice, 172; poly-
nice, 172.

Euryl*mid.e, 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.

GALAPAGOS, 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.

Geology, facts proved by, 2-5.

Giraffe, how it acquired its long
neck, 42.

Glj:a, 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 cratosmnoides, 94.

Gymnocerous capucinus, 96.

Gymnocerous dulcissimus, 97.

Gunther, Dr., on arboreal snakes,
55; on colouring of snakes, 102.

Gynecia dirce, 59.

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 diodcm, 107.

Heiliplus, a hard genus of Cur-
culionidse, 94.

Helicon Id.e, the objects of mimi-
cry, 77; their secretions, 88;
not attack: d by birds, 79; some-
times mimicked by other Heli-
conidse, 85.

Helladotherium, 300.

Hemiptera, protected by bad
odour, 72.

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