Abstract
An artificial key is presented to separate the second to fourth instar mosquito larvae of eastern United States and Canada, west to and including Texas and Manitoba. A second, natural key, separates the genera and many of the subgenera. A list of the 134 included species and subspecies with their ranges within this region is given, with indicated corrections since Carpenter and LaCasse (1955) and the Stone et al. (1959) catalog. Larvae of two species are unknown.

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