The duration of the 1st and 2nd gonotrophic cycles of An. culicifacies and An. stephensi were estimated at temperatures ranging from 16 to 28 C in an incubator and in nature using mark-recapture methods. Heat summation models were calculated for the velocity of ovarian maturation for both species below 28 C, since at higher temperatures the duration of the gonotrophic cycle appears behaviorally regulated by activity rhythms. During February sexual maturity of released males was delayed, resulting in a reduced insemination rate of concomitantly released and recaptured females of the same cohort. Life history events such as insemination, the initiation of ovarian development beyond resting stage IIa and parity were delayed during winter, with An. stephensi maturing faster than concurrently released An. culicifacies. Survivorship and life expectancy curves for both species were generated from the corrected daily recapture rate and indicated that females lived longer than conspecific males and that survivorship increased after the females had imbibed a blood meal and located a suitable resting site, but decreased during oviposition and refeeding. A high incidence of gonotrophic discordance occurred among released An. culicifacies and, to a lesser extent, An. stephensi.