A Vespula pensylvanica/Vespula vulgaris Nest (Hymenoptera: Vespidae) 1

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Abstract
An instance of a Vespula vulgaris nest being usurped or adopted by a V. pensylvanica queen is reported. The gradual replacement of V. vulgaris workers by V. pensylvanica workers was evidenced by a gradual transition in the nest from tan, brittle V. vulgaris paper to gray, flexible V. pensylvanica paper. Intraspecific competition for nests by queens is probably common and interspecific competition for nests is likely where there is an overlap in the distribution of 2 closely related species.

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