Source : Webster's Revised Unabridged Dictionary (1913)

Culex \Cu"lex\, n. [L., a gnat.] (Zo["o]l.)
   A genus of mosquitoes to which most of the North American
   species belong. Some members of this genus are exceedingly
   annoying, as {C. sollicitans}, which breeds in enormous
   numbers in the salt marshes of the Atlantic coast, and {C.
   pipiens}, breeding very widely in the fresh waters of North
   America. (For characters distinguishing these from the
   malaria mosquitoes, see {Anopheles}, above.) The yellow-fever
   mosquito is now placed in another genus, {Stegomyia}.