1. Wheeler, W.M.: Ants. New York-London: Columbia Univ. Press 1965
2. Wilson, E.O.: The Insect Societies. Cambridge, Mass.: Harvard Univ. Press 1971
3. Roepke, W.: Misc. Zool. Sumatrana 45, 1 (1930)
4. Bünzli, G.H.: Mitt. Schweiz. Entomol. Ges. 16, 453 (1937)
5. Brown, W.L.: J. West China Border Res. Soc. (B) 15, 185 (1945)