Autogeny was studied in Culex salinarius from College Station, Texas; Vero Beach, Florida; and Edison and Dennisville, New Jersey. Autogenous egg development varied from 14% in the Florida colony to 23 and 27%, respectively, in colonies from Texas and New Jersey. The mean number of eggs per autogenous female ranged from 13.5 to 23.7. As in other autogenous mosquitoes, the expression of autogeny was dependent on larval and adult diets. Mating did not influence autogeny as it does in some mosquitoes. Autogeny in Cx. salinarius was obligate at warm temperatures, but females denied a bloodmeal appeared to undergo facultative autogeny at colder temperatures.