Abstract
1. Data on the natural occurrence of the microgyne form ofMyrmica rubra L. are given, showing it to be more common than previously suspected. 2. Morphometrics show that the microgynes are an isometric reduction of the normal queens. 3. Experimental evidence is given to show that microgynes tend to breed true and that they have a queen effect that is similar to normal queens. 4. The origin of the microgyne polymorphism is discussed and it is concluded that it is genetic, microgynes perhaps being an atavistic form of the species.
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