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CORRIGENDUM Volume 39, No. 4 HETEROGENEITY IN THE TRINIDAD DDT-RESISTANT STRAIN AND THE QS SUSCEPTIBLE STRAIN OF AEDES AEGYPTI L. The Isolation of Highly Resistant and Highly Susceptible Substrains Page 639: Synopsis, lines 9-10 Delete: Variation between progenies in the already very resistant TRIN strain was marked. Insert: Variation between progenies in the already very resistant TRIN strain was not marked.