Abstract
The insect examples which Krebs used to illustrate the Chitty Hypothesis of self-regulation in animal population dynamics are updated. For the larch bud moth, Zeiraphera diniana, regulation still is best explained by environmental factors. With the several species of plague locusts, including Locusta migratoria, L. pardalina, and Schistocerca gregaria, locustol and two potential pheromones combine to produce an apparent perpetual state of gregarisation. On present evidence, self-regulation by means of microevolution does not appear to be involved in the action of locust chemical releasing stimuli; so that, for the moment, neither entomological test case can be said to support the Chitty Hypothesis.
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