Polyergus

The authors thank Patrizia D'Ettorre for review of data on Polyergus and Formica sanguinea species biology and the commentaries of two anonymous referees that improved considerably the paper.

Le Moli, "Comparison of reproductive strategies and raiding behaviour in facultative and obligatory slave-making ants: the case of Formica sanguinea and Polyergus rufescens," Insectes Sociaux, vol.

Talbot, "Slave-raids of the ant Polyergus lucidus Mayr," Psyche, vol.

Greenberg, "Mating behavior of the socially-parasitic ant, Polyergus breviceps: the role of the mandibular glands," Psyche, vol.

Ugolini, "Ecoethological factors affecting the scouting and raiding behaviour ofthe slave-making ant Polyergus rufescens Latr.

Le Moli, "Specifity in host choice by the slave-making ant Polyergus rufescens Latr.

Morale, "Modeling the aggregative behavior of ants of the species Polyergus rufescens" Nonlinear Analysis: Real World Applications, vol.

An experimental study of egg discrimination by hosts of the social parasite Polyergus breviceps (Hymenoptera: Formicidae)," Behavioral Ecology and Sociobiology, vol.

rufa, and Polyergus lucidus; see Page, 1986 for references), but these data must be considered with caution.

The formicine slave-makers (Formica sanguinea group, Polyergus, and Rossomyrmex) do not often form high density populations, but species ranges often encompass large regions of Eurasia and North America (Pamilo, 1981; Holldobler and Wilson, 1990; Topoff, 1990).