Odonestis potatoria, sexual difference of colour in.
Odour, correlation of, with colour of skin; of moths; emitted by snakes
in the breeding season; of mammals.
Oecanthus nivalis, difference of colour in the sexes of.
Oecanthus pellucidus.
Ogle, Dr. W., relation between colour and power of smell.
Oidemia.
Oliver, on sounds produced by Pimelia striata.
Omaloplia brunnea, stridulation of.
Onitis furcifer, processes of anterior femora of the male, and on the
head and thorax of the female.
Onthophagus.
Onthophagus rangifer, sexual differences of; variations in the horns of
the male.
Ophidia, sexual differences of.
Ophidium.
Opossum, wide range of, in America.
Optic nerve, atrophy of the, caused by destruction of the eye.
Orang-Outan, Bischoff on the agreement of the brain of the, with that
of man; adult age of the; ears of the; vermiform appendage of; hands of
the; absence of mastoid processes in the; platforms built by the;
alarmed at the sight of a turtle; using a stick as a lever; using
missiles; using the leaves of the Pandanus as a night covering;
direction of the hair on the arms of the; its aberrant characters;
supposed evolution of the; voice of the; monogamous habits of the;
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