Wyeomyia smithii, the pitcher plant mosquito, is an inquiline mosquito that completes its pre-adult life cycle in the phytotelma (water-filled cavity) of the purple pitcher plant, Sarracenia purpurea. In this microcommunity of bacteria, rotifers, protozoa, and midges, W. smithii is the top-level predator; its presence determines the bacterial species diversity within the pitcher.

W. smithii is not a pest mosquito in general. The northern US population does not consume blood at all, while the southern US populations only consume blood after laying an initial egg batch; even then they appear disinterested in feeding. In fact, it is the only known mosquito to have both obligatory biting and non-biting populations in the same species.

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