DARWIN, Mr., his principle of utility, 47;
on cause of colour in flowers, 127, 262;
on colours of caterpillars, 118;
on sexual colouration, 260;
his metaphors liable to misconception, 269;
criticism of, in _North British Review_, 291.

DESERT animals, colours of, 49, 50.

DIADEMA, species of, mimic Danaidae, 86, 87;
female with male colouration, 112.

_Diadema misippus_, 112;
_D. anomala_, 113.

_Diaphora mendica_, 89.

DICNYODONTIA, 299.

DICROURUS, 253.

_Diloba coeruleocephala_, 120.

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

DINOSAURIA, 298.

DIPTERA mimicking wasps and bees, 97.

_Doliops curculionides_, 94.

DOMESTICATED animals, their essential difference from wild
ones, 38-41.

DOTTERELL, 251.

DRUSILLA, mimicked by three genera, 181.

_Drusilla bioculata_, 180.

DYTISCUS, dimorphism in, 155.

EGYPTIAN architecture, introduced, 225.

_Elaps fulvius_, _E. corallinus_, _E. lemniscatus_, 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 tritaea_, 172;
_valeria_, 172.

_Eroschema poweri_, 93.

ERYCINIDAE mimic Heliconidae, 84.

_Erythroplatis corallifer_, 92.

ESTRELDA, sexual colouring and nidification of, 243.

EUCNEMIDAE, mimicking a Malacoderm, 93.

_Eudromias morinellus_, 251.

_Euglossa dimidiata_, 98.

EUMORPHIDAE, a protected group 72;
imitated by Longicorns, 92.

EUPLOEA, local modifications of colour in, 173.

_Euploea midamus_, 87-113, 179;
_E. rhadamanthus_, 87, 179.

_Eurhinia megalonice_, 172;
_polynice_, 172.

EURYLAEMIDAE, 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 requires more protection than the male, 258.

FISHES, protective colouring of, 55.

FISSIROSTRAL birds, nests of, 238.

FLOWERS