Abstract
This paper concerns populations of the ant Aphaenogaster rudis Emery studied at St. Charles County, Missouri, during 1947–1949. All collections were made in the autumn, winter, and spring, and thus the paper supplements a summer study of Aphaenogaster rudis made by A. E. Headley in northern Ohio (Headley, 1949), giving together a year-around picture of their nesting conditions, maturing of brood, and hibernation.

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