Complexity of the Culex pipiens complex in California.

In California, the complex consists of , , their hybrids and form Using 15 microsatellite markers and a variety of statistical analyses of within- and among-population variation, there is widespread introgression throughout the Central Valley with mostly genotypes in the south and in the north. Those specimens in the Sacramento County area consisted primarily of - and - hybrids. Populations in Coachella Valley and Los Angeles, CA and Benton, WA were and , respectively. Studies are underway to relate these genotypes to phenotypes of autogeny, diapause and vector competence for West Nile Virus.