A case of a queenright colony of Formica pratensis Retz. mixed with the workers of F. cinerea Mayr and some workers of F. sanguinea Latr. is described. The colony characterized by this composition has evolved from a pure F. cinerea colony that had been raided by F. sanguinea two years earlier. Another conflict with the same F. sangui nea revealed the composition of this colony. The presumed circumstances of the origin of the specific mixed colony are discussed in this paper.
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