The bionomics ofAedes cantatorwere investigated under laboratory and field conditions. Less than 2% of the females reared from larvae and pupae under specified laboratory conditions matured eggs in the absence of vertebrate blood; limited autogeny occurred in early season broods. Anautogenous fecundity was significantly greater than autogenous egg production. Nearly half of the 455 resting and host-seeking females examined had not yet completed an ovarian cycle (42.4% nulliparous), and that of the 198 parous specimens collected, only 7 (1.5%) survived the 4th gonotrophic cycle and initiated the 5th.A 50-m2salt-marsh study plot was used to observeA. cantatoron blooming plants.Chrysanthemum leucanthemum,Malva neglecta,Achillea millefolium,Rosa palustris Hieracium pratense, Daucus carota, andSolidago sempervirensserved as nectar sources for 449 adults (283 ♀, 166 ♂). During July,A. cantatorshifted preference fromC. leucanthemumtoA. millefoliumandH. pratense. Of the total 1633 females analyzed for nectar sugars by either anthrone or thin-layer chromatography, more than 50% contained one or more of the primary nectar sugars. Significantly more females contained nectar sugars in the salt marsh (avg 57% positive) than specimens in inland forests (avg 19.6%). Results indicate that males and females frequently feed on nectar in the marsh and thereby supplement their stored nutritional reserves before dispersal.