1. Relationships between the ant Brachymyrmex obscurior (Hymenoptera, Formicidae) and Acacia pennatula (Fabaceae)

   • G. Moya-Raygoza

   Research article Pages: 105 - 107

2. Food availability and brood number do not influence intraspecific aggression in Argentine ants

   • M. L. Thomas
   • A. Dixson
   • D. A. Holway

   Research article Pages: 108 - 113

3. How queen and workers share in male production in the stingless bee Melipona subnitida Ducke (Apidae, Meliponini)

   • D. Koedam
   • F. A. L. Contrera
   • V. L. Imperatriz-Fonseca

   Research article Pages: 114 - 121

4. Ultrastructural characterization of spermatozoa in euglossine bees (Hymenoptera, Apidae, Apinae)

   • U. Zama
   • J. Lino-Neto
   • H. Dolder

   Research article Pages: 122 - 131

5. Soldier caste with morphological and reproductive division in the aphid tribe Nipponaphidini

   • T. Fukatsu
   • A. Sarjiya
   • H. Shibao

   Research article Pages: 132 - 138

6. The influence of marking upon bee behaviour in circle tube experiments with a methodological comparison among studies

   • L. Packer

   Research article Pages: 139 - 146

7. Effect of group size on the aggression strategy of an extirpating stingless bee, Trigona spinipes

   • J. C. Nieh
   • K. Kruizinga
   • V. L. Imperatriz-Fonseca

   Research article Pages: 147 - 154

8. Facultative sexual reproduction in the parthenogenetic ant Platythyrea punctata

   • A. Hartmann
   • J. Wantia
   • J. Heinze

   Research article Pages: 155 - 162

9. A genetic component in the determination of worker polymorphism in the Florida harvester ant Pogonomyrmex badius

   • F. E. Rheindt
   • C. P. Strehl
   • J. Gadau

   Research article Pages: 163 - 168

10. The triple alliance: how a plant-ant, living in an ant-plant, acquires the third partner, a scale insect

    • J. Moog
    • L. G. Saw
    • U. Maschwitz

    Research article Pages: 169 - 176

11. Comparative analysis of caste differentiation during embryogenesis of social aphids whose soldier castes evolved independently

    • N. Ijichi
    • H. Shibao
    • T. Fukatsu

    Research article Pages: 177 - 185

12. Queen size dimorphism in the ant Tetramorium moravicum (Hymenoptera, Formicidae): Morphometric, molecular genetic and experimental evidence

    • B. C. Schlick-Steiner
    • F. M. Steiner
    • B. Seifert

    Research article Pages: 186 - 193

13. Facultative polygyny in Ectatomma tuberculatum (Formicidae, Ectatomminae)

    • R. R. Hora
    • E. Vilela
    • J. Delabie

    Research article Pages: 194 - 200

14. A simple design for a rain-resistant pitfall trap

    • S. D. Porter

    Technical note Pages: 201 - 203

15. Erratum

    • No author

    Erratum Pages: 204 - 204