Within-colony size variation of foragers and pollen load capacity in the stingless bee Melipona quadrifasciata anthidioides Lepeletier (Apidae, Hymenoptera) M. Ramalho, V. L. Imperatriz-Fonseca and T. C. GianniniApidologie, 29 3 (1998) 221-228DOI: https://doi.org/10.1051/apido:19980302