Abstract
During November and December 1969, larvae and adults of the Anopheles gambiae complex from the Kisumu area of Kenya were identified by cytogenetical methods as species A and B. There appeared to be no difference between their choice of larval habitats. Although adults of both species were common in village huts, species B comprised 80·6% of the exophilic population. Adults of both species caught from huts and out of doors had fed predominantly on bovids; the incidence of human feeds was below 40%. The impact of residual insecticidal house-spraying would depend on the relative sizes of the endophilic and exophilic populations of species B.

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