Abstract
There was monofactorial inheritance of parathion-resistance in larvae of the strain of Culex pipiens pallens that was selected with ethyl-parathion for 18 generations and showed twenty-fold resistance to the selecting insecticide. The factor for parathion-resistance was incompletely dominant and calculated to be linked with a recombination value of 17-20% to the malathion-resistance factor which has been reported to be in linkage group 2.
