Abstract
Adult female mosquitoes were collected in Boston from a site containing both autogenous and anautogenous Culex pipiens, and the progeny derived from each mosquito were inbred for 5 successive generations. Although autogenous lines were little affected by this mating of siblings, anautogenous lines rapidly lost viability. By the 5th anautogenous generation, ⅕ of eggs failed to embryonate, ¼ of embryonated eggs failed to hatch, and ⅔ of hatched larvae failed to complete adult development. Morphological variants appeared to be more numerous among progeny of anautogenous lines than of autogenous lines. Thus, mating between siblings may occur more frequently among autogenous than anautogenous C. pipiens.

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