Lane, C. JOHN. "On a collection of Culicinae (Diptera: Culicidae) from Brazil." Mosquito Systematics 24.1 (1992): 16-22.
or
Smith, Julie L., and Dina M. Fonseca. "Rapid assays for identification of members of the Culex (Culex) pipiens complex, their hybrids, and other sibling species (Diptera: Culicidae)." The American journal of tropical medicine and hygiene 70.4 (2004): 339-345.
Just paste them into your browser and they do open, although I'm not sure how useful they will be as one is for Sri Lanka and teh other for Saginaw County, Michigan.