Abstract
Summary It is shown that measurement of the labial palpus can give a useful estimate of proboscis length; correlation coefficients are given for bees of both species. Differences between the two species for all measurements of proboscis parts were highly significant. For measurements that were closely correlated with the length of labial palpus, differences between two colonies of the same species (and race) were also highly significant. Other conclusions are drawn from the results about the relative lengths of parts of the proboscis.

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