1. Hybridization of chromosome-polymorphic populations of the inquiline ant,Doronomyrmex kutteri (Hym., Formicidae)

   • A. Buschinger
   • K. Fischer

   Research Articles Pages: 95 - 103

2. Comb cutting inRopalidia plebeiana: a new process of colony fission in social wasps (Hymenoptera: Vespidae)

   • S. Yamane
   • Y. Itô
   • J. P. Spradbery

   Research Articles Pages: 105 - 110

3. Life span of queens in the antFormica exsecta

   • P. Pamilo

   Research Articles Pages: 111 - 119

4. Polymorphism and size-pairing in the harvester antPogonomyrmex badius: a test of the ecological release hypothesis

   • J. F. A. Traniello
   • S. N. Beshers

   Research Articles Pages: 121 - 127

5. Dispersed central place foraging in Australian meat ants

   • J. D. McIver

   Research Articles Pages: 129 - 137

6. Hunting behaviour, prey capture and ant avoidance in the tropical social waspPolybia sevicea (Hymenoptera: Vespidae)

   • M. Raveret Richter
   • R. L. Jeanne

   Research Articles Pages: 139 - 147

7. Polyéthisme et défense de la société chez la fourmi champignonnisteAtta laevigata (Fr. Smith)

   • A. Salzemann
   • K. Jaffe

   Research Articles Pages: 149 - 159

8. Task-specific distribution of the two worker castes in extranidal activities inMacrotermes bellicosus (Smeathman): Observation of behaviour during food acquisition

   • J. -A. Lys
   • R. H. Leuthold

   Research Articles Pages: 161 - 170

9. Colony dynamics in a primitively eusocial halictine beeLasioglossum (Dialictus) zephyrum (Hymenoptera: Halictidae)

   • P. F. Kukuk
   • B. May

   Research Articles Pages: 171 - 188

10. Diet does not affect intercolonial fighting in Leptothoracine ants

    • T. M. Alloway
    • A. Leighl
    • D. Ryckman

    Research Articles Pages: 189 - 193

11. The population biology ofTapinoma minutum (Hymenoptera: Formicidae) in Australia

    • J. M. Herbers

    Research Articles Pages: 195 - 204

12. An experimental analysis of pleometrotic advantage in the desert seed-harvester antMessor pergandei (Hymenoptera; Formicidae)

    • S. W. Rissing
    • G. B. Pollock

    Research Articles Pages: 205 - 211

13. Unmated queens in the primitively eusocial waspRopalidia marginata (Lep.) (Hymenoptera: Vespidae)

    • K. Chandrashekara
    • R. Gadagkar

    Short Communication Pages: 213 - 216

14. Heinrich Kutter (1896–1990)

    • Cesare Baroni Urbani
    • Daniel Cherix

    In Memoriam Pages: 217 - 218

15. Leo Pardi (1900–1990)

    • Stefano Turillazzi

    In Memoriam Pages: 219 - 220