The development, survivorship, longevity and fecundity of Wyeomyia mitchellii (Theobald, 1905) were examined in the laboratory. The eggs hatched within 5–6 days. The larval stage required a total of 33.7 days (4.8, 2.1, 12.3, and 14.5 days for first, second, third and fourth instars, respectively). The length of time to complete the pupal stage was 5–6 days. The egg and pupal stages had higher survival rates (0.82 and 0.95, respectively) than the larval stage (0.33). Among the larval stage, the lowest survival rate was found in the 2nd instar (0.59) and the highest survival rate was found in the 4th instar (0.95). The mean life spans of the adult male and female mosquitoes were 18.6 and 26.4 days, respectively. Pre-oviposition period ranged from 7–8 days. The gross fecundity rate was 25.8 eggs per female. Based on the life history of W. mitchellii, some basic demographic parameters were also estimated. The net reproductive rate (R0) was 3.42 female offspring per female per generation, the mean generation time (T) was 70.5 days, and the intrinsic rate of increase (r) was 0.0174. The result of this study indicates that W. mitchellii is unlikely to build up its population rapidly because of its slow development of the immature stages and the low fecundity of adult.
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Vol. 83 • No. 1