AGE STRUCTURE OF ADULT MOSQUITO (DIPTERA, CULICIDAE) POPULATIONS FROMBUENOS-AIRES PROVINCE, ARGENTINA

In order to detect seasonal trends in the age structure of adult mosqu itoes from Buenos Aires province, Argentina, female populations were s ampled with CDC traps during 1989-1991 in Punta Lara and La Plata. The mosquitoes were dissected and age-grouped according to ovarian trache ation and ovariolar stages. All Runchomyia paranensis females were par ous, suggesting that this species could be autogenous. Aedes albifasci atus showed parous peaks following population peaks, with shorter dela ys in spring-summmer and longer in fall-winter. Ae. crinifer and Culex dolosus showed wide fluctuations in age structure due to adult emerge nces during all months. Psorophora ferox showed high population replac ement rates. Mansonia indubitans and Ma. titillans have few generation s per year during their activity period. This is the first report on a ge-grading of adults of field mosquito populations from Argentina.