Abstract: Lenka PETRÁKOVÁ & Jiří SCHLAGHAMERSKÝ Lenka Petráková, Dr. Jiří Schlaghamerský (contact author), Department of Botany and Zoology, Faculty of Science, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic. E-mail: jiris@sci.muni.cz Myrmecol. News 10: 118 Mainly based on anecdotal evidence (e.g., Zdobnitzky 1910) the dolichoderine ant Liometopum microcephalum (Panzer, 1798) has been reported to be very aggressive. From these observations, it is apparent that the species is territorial and therefore occupies a high position in the ant hierarchy. However, little well-founded evidence on its interactions with other ants and on its position in the hierarchy of myrmecocoenoses has been published. In this respect we have more data on North American Liometopum species than on the single European representative of the genus (Alan 1997). The northwestern border of the range of the species is situated in southernmost Moravia (Czech Republic), where it is almost restricted to the floodplains of the Rivers Dyje…