The Supposed Correlation between the Ratio X5 and DDT-Resistance in House Flies12

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Abstract
The ratio of X5, defined by Bigelow and LeRoux as the width of the second abdominal sternite divided by its length, was measured on both sexes of eight strains of house flies, Musca domestica L., differing in their susceptibility to DDT. Resistance levels were determined by topical application of the insecticide followed by a maximum likelihood probit analysis of the results. Significant differences among strains and among rearing jars within strains were found, as in an earlier study by Sokal and Hunter. Significant differences between resistant and nonresistant strains were found for X5, but the difference was opposed to that reported by Bigelow and LeRoux and by Morrison. Further analyses led to the conclusion that the difference between resistant and nonresistant strains is due to the particular strains composing the present study and that no correlation between resistance and X5 can be demonstrated.
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