380 
beetles, 91; of other insects by 
beetles, 95; of insects by species 
of other orders, 97; among the 
vertebrata, 99; among snakes, 
101; among tree frogs, 103; 
among birds, 103; among mam- 
mals, 107; objections to the 
theory of, 108; by female in- 
sects, 110; among Papilionida, 
179; never occurs in the male 
only, 260. 
Monoripa#, sexual colouring and 
nidification of, 241. 
Monrrovzier, M., on butterflies 
of Woodlark Island, 152. 
Monrat sense, difficulty as to the 
origin of, 352. 
Morenos, how protected, 73. 
Murray, Mr. Andrew, objections 
to theory of mimicry, 108. 
Muscicarip#, sexual colouring 
and nidification of, 245. 
Musopuacips, sexual colouring 
and nidification of, 242. 
NAPEOGENES, all the specics 
are mimickers, 85. 
Narurav selection, the principle 
stated, 41-43; general accept- 
ance of the theory of, 46; 
tabular demonstration of, 302; 
outline of theory of, 307; its 
effects on man and animals dif- 
ferent, 311; hardly acts among 
civilized societies, 330; what it 
can not do, 333; cannot pro- 
duce injurious or useless modi- 
fications, 334. 
Necranineipa, 254, 
Necypauipz, mimic Hymenop- 
tera, 96. 
INDEX, 
Nemophas grayi, a Longicoru mi- 
micked by a Longicorn, 95. 
Nests of Birds, why different, 
215; of young birds, how built, 
219; construction of, described 
by Levaillant, 224; imperfec- 
tions in, 229; influenced by 
changed conditions and per- 
sistent habits, 232; classification 
of, according to function, 237. 
New rorms, how produced by 
variation and selection, 286, 
New Guinea, relation of the seve- 
ral Papuan islands to, 194. 
Nocturna animals, colours of, 
51. 
Nomapa, 98. 
OBEREA, species resemble Ten- 
thredinidex, 96. 
Odontocera odyneroides, 96. 
OponrocuEiua, 97. 
Odynerus sinuatus, 90. 
Onthophilus sulcatus, like a seed, 
58. 
Onychocerus 
bark, 56. 
Ornanae-tir butterfly, proteohive 
colouring of, 59, 
Orcuis, structure of an, explained 
by natural selection, 271. * 
Orgyia antigua and O. gonostigma, 
autumnal colours of, 62. 
OntoLipz, 2538. 
Ornithoptera priamus, 145, 173; 
O. helena, 173. 
Oxyrhopus petolarius, O. trigemi- 
nus, O. formosus, 102. 
Owen, Professor, on more gene- 
ralized structure of extinct ani- 
mals, 298, ‘ 
scorpio, resembles 
