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.