Abstract
Pollen sources used by Centris trigonoides bees were identifıed in an area of the Caatinga vegetation by analysing the pollen residues encountered in their nests. Twenty-eight pollen types were identifıed, and the most frequently found were Chamaecrista ramosa (46.45%; Leguminosae-Caesalpinioideae), Solanum paniculatum (16.65%; Solanaceae) and Zornia echinocarpa (10.27%; Leguminosae-Papilionoideae). The identifıcation of the pollen types and information about the resources offered by the plants indicated that many species were visited as nectar sources rather than as pollen or oil sources by Centris trigonoides.
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