Larval and adult mosquito surveys, conducted in woodland habitats near Ithaca, N. Y., during a summer of excessive precipitation (1972) and one of more normal rainfall (1973), revealed differences in the seasonal occurrence of Aedes canadensis (Theobald) larvae, times of adult emergence, and seasonal parity. A 2nd larval brood of Ae. canadensis occurred in woodland pools during July 1972. Percentages of parous specimens in 1972 were consistently lower than percentages computed for 1973; the lower parity values were probably due to the influence of inclement weather and heavy rainfall. With the exception of a sharp decline in percentage parous following the 2nd brood in 1972, a gradual and uniform increase in parity was observed during each season. Females were easily collected through mid-August of each year, but during 1972 this mosquito was a major nuisance in woodland habitats from late June through late July.