Abstract
The role of unmated queens in laboratory colonies of the pharaoh's antMonomorium pharaonis L. (Hymenoptera, Myrmicinae) has been investigated. In contrast to the findings by other authors we find that these females are unable to suppress the rearing of new sexuals. This is neither contingent upon the age of the unmated queens nor on the physiological condition of the colonies. In societies of different origin the situation was the same. Only after copulation are the females able to suppress the development of new sexual broods. These findings are discussed within the framework of the hypothesis established byBerndt (1975) about a pheromone controlling cyclic production of sexuals. Results on the receptivity of the unmated females in connection with a copulation effected by the parthenogenetically produced sons are presented. Furthermore, information is given on the behaviour of the unmated queen and her longevity.
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