plant louse

On the 4th of August, about one o'clock in the afternoon, I put into solitary confinement a plant-louse of the third generation.

The Red Ant (Formica rufa) is singularly adroit in seizing the droplet left it by the plant-louse.

On one of these leaves he placed a plant-louse, which was born under his own eyes, of a wingless mother.

When they have got possession of a plant-louse, they excite it to secrete this liquid, but without doing it any harm.

Sometimes house plants, and out-door plants as well, become covered with a small, green insect called the plant louse or aphis.