Abstract

The temperature of the environment has a wide-spread influence upon the distribution, abundance and activities of insects, for it affects the possibility and rate of growth and development. Distribution may be controlled by the action of extremes of environmental temperatures which may function as insecticides. From the many effects of environmental temperatures one is here chosen for study; namely, the effect of temperatures of the insect on its freezing points. From all the possible groups of insects available, one ecological group is selected; namely the borers found under the bark of oak trees which are exposed under natural conditions to great extremes of heat and cold. In such insects the environmental temperatures, whether high or low, play a leading r6le in the determination of freezing points.

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