SummaryIn 1968 and 1969 six experiments on groups of 6–9 colonies fitted with pollen traps showed that: (1) there was a significant correlation between the amount of unsealed brood and the amount of pollen collected during each experimental period; (2) queenless colonies without brood collected only small amounts of pollen; (3) colonies which had similar amounts of unsealed brood collected different amounts of pollen at different locations and in different months.