A completely chemically defined dietary medium previously shown to support good development of aseptic, newly-hatched larvae of Culex pipiens and Aedes aegypti to the adult stage is also able to support growth and development of 7 other mosquito species. Cx. quinquefasciatus, Cx. peus, Ae. taeniorhynchus, and Ae. sierrensis performed well (60% or more of the starters became adult). Cx. coronator and Cx. tarsalis developed well to the 4th instar, but increased mortality then resulted in adult percentages of generally less than 40. Ae. dorsalis developed well to the 3rd instar, when most died. Most Anopheles freeborni died without development in the 1st instar; the few that molted once died shortly thereafter.