Pollen was obtained and identified from corbiculae of Trigona williana worker bees over a one year period at the INPA eampus in the city of Manaus. Ranked by numher of pollen grains, the dominant plant famíles were: Arecaceae, Melastomataceae, Myrtaceae, Caricaceae, Moraceae and Malpighiaceae. Dominant plant species were Cocos nueifera, Maximiliana martiana, Cassia sp., Cariea papaya, Bellucia grossularioides, Artocarpus incisa and Stachytarpheta cayennensis. Fewer plant species were exploited in the rainy season ¡han in the dry season.