A parity profile on an Aedes sollicitans (Walker) population in New Jersey revealed that the physiological age structure varied considerably over the course of a season. A total of 2,067 specimens collected at weekly intervals over a 2 year period revealed 957 nulliparous, 959 I-parous, 131 2-parous and 20 3-parous mosquitoes. Multiparous specimens were most common in the later portion of the season in both years. Mosquitoes which had completed 2 gonotrophic cycles were not collected until early July and 3-parous Ae. sollicitans were not collected until mid August. By early September, multiparous specimens made up more than 10% of the collections in 1974 and nearly 17% in 1975. The physiological age structure of the population also varied in collections made at different distances inland from the salt marsh/upland ecotone. Nulliparous specimens predominated at the sites farthest inland and multiparous mosquitoes were most commonly collected closer to the salt marsh.