MIMICRY AND OTHER PROTECTIVE RESEM-

BLANCES AMONG ANIMALS

The colours of animals are useful for concealment from
their prey, from the creatures upon which they prey.

A scale insect threatened with ruin the orchards of
California. Professor C. V. Riley decided that the
pest was a native of Australia.
serves in Australia that the pest is kept down by lady-
Mr. A. Hoebele ob-
birds. These are accordingly sent to California where
they destroy the scale insect and restore prosperity
among the fruit-growers. Another pest, of olive
trees, is devoured by an imported ladybird of another