Abstract
Summary. 1 Ecological observations are described which make probable the existence of warning coloration and Mullerian mimicry among certain species of Hydrachnidae. 2 Experiments are described which show that these are distasteful to and recognized by Sticklebacks (Gasterosteus aculeatus). 3 There is evidence that scarlet is the colour best remembered by these fish. This makes the evolution of such a set of Mullerian mimics more easy to understand. 4 Other evidence is given in support of these conclusions.
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