Relationships between the ant Brachymyrmex obscurior (Hymenoptera, Formicidae) and Acacia pennatula (Fabaceae) G. Moya-Raygoza Research article Pages: 105 - 107
Food availability and brood number do not influence intraspecific aggression in Argentine ants M. L. ThomasA. DixsonD. A. Holway Research article Pages: 108 - 113
How queen and workers share in male production in the stingless bee Melipona subnitida Ducke (Apidae, Meliponini) D. KoedamF. A. L. ContreraV. L. Imperatriz-Fonseca Research article Pages: 114 - 121
Ultrastructural characterization of spermatozoa in euglossine bees (Hymenoptera, Apidae, Apinae) U. ZamaJ. Lino-NetoH. Dolder Research article Pages: 122 - 131
Soldier caste with morphological and reproductive division in the aphid tribe Nipponaphidini T. FukatsuA. SarjiyaH. Shibao Research article Pages: 132 - 138
The influence of marking upon bee behaviour in circle tube experiments with a methodological comparison among studies L. Packer Research article Pages: 139 - 146
Effect of group size on the aggression strategy of an extirpating stingless bee, Trigona spinipes J. C. NiehK. KruizingaV. L. Imperatriz-Fonseca Research article Pages: 147 - 154
Facultative sexual reproduction in the parthenogenetic ant Platythyrea punctata A. HartmannJ. WantiaJ. Heinze Research article Pages: 155 - 162
A genetic component in the determination of worker polymorphism in the Florida harvester ant Pogonomyrmex badius F. E. RheindtC. P. StrehlJ. Gadau Research article Pages: 163 - 168
The triple alliance: how a plant-ant, living in an ant-plant, acquires the third partner, a scale insect J. MoogL. G. SawU. Maschwitz Research article Pages: 169 - 176
Comparative analysis of caste differentiation during embryogenesis of social aphids whose soldier castes evolved independently N. IjichiH. ShibaoT. Fukatsu Research article Pages: 177 - 185
Queen size dimorphism in the ant Tetramorium moravicum (Hymenoptera, Formicidae): Morphometric, molecular genetic and experimental evidence B. C. Schlick-SteinerF. M. SteinerB. Seifert Research article Pages: 186 - 193
Facultative polygyny in Ectatomma tuberculatum (Formicidae, Ectatomminae) R. R. HoraE. VilelaJ. Delabie Research article Pages: 194 - 200
