Abstract
In the Colorado Desert of California, female Culiseta inornata (Diptera: Culicidae) were active from Sept.-June, while males were active from Oct.-May. In airborne populations, during Oct. through Feb., nullipars comprised 40% or less of the empty females examined. Parous females alone were captured in Sept., and from Mar.-June. Among resting females, the occurrence of nullipars varied directly with changing population level in Oct. and Nov. (between 0 and 50% of empty females=nulliparous), but inversely with levels during Feb. and Mar. (100% of empty females=nulliparous). Aestival populations of C. inornata were inferred to consist of small numbers of females who either possess fully developed oocytes, or have completed at least one gonotrophic cycle. Male C. inornata do not survive the summer.
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