Larval mosquitoes develop in standing water whereas the adults can fly and only the females bite.
Salt marshes at the southern end of the San Fransisco Bay produce a single seasonal brood of Aedes squamiger and multiple broods of Aedes dorsalis . Both of these mosquito species can fly considerable distances and are aggressive biters. Other important pest mosquitoes include the house mosquitoes, Culex pipiens , which as the name implies tends to enter homes and bite people. The anopheline mosquitoes are potential carriers of malaria which was once a big problem in our area. Now malaria is present in infected people entering the county from malarious countries.