Day-to-Day Change in Relative Humidity and the Activity ofCulex nigripalpus(Diptera: Culicidae)

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Abstract
A variate-difference method of analysis was used to study bait- and suction-trap collections of the mosquitoes Culex nigripalpus Theobald and Aedes tacniorhynchus (Wiedemann). Day-to-day differences (first differences) in successive catches of C. nigripalpus (but not of A. tacniorhynchus) were correlated significantly with day-to-day differences (first differences) in the relative humidity 1 hour after sunset. In spite of a demonstrated relationship of rainfall to the level of relative humidity 1 hour after sunset, the relationship of change in C. nigripalpus to change in relative humidity existed also on days without rain. Day-to-day differences in trap collections are discussed as a measure of population activity.

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