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.

中文翻译：

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相对湿度的日常变化和黑库蚊（双翅目：库蚊科）的活动

分析的变量差异方法用于研究蚊子 Culex nigripalpus Theobald 和 Aedes tacniorhynchus (Wiedemann) 的诱饵和吸引器收集。连续捕获 C. nigripalpus（但不是 A. tacniorhynchus）的日间差异（第一次差异）与日落后 1 小时相对湿度的日间差异（第一次差异）显着相关。尽管已证明降雨量与日落后 1 小时的相对湿度水平之间存在关系，但在没有下雨的日子里，黑背海棠的变化与相对湿度变化的关系也存在。陷阱收集的日常差异作为种群活动的衡量标准进行了讨论。