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Female:
Adult females can be confused with Cx. quinquefasciatus and some cannot be distinguished, but the laterally constricted tergal basal bands and scale patches on the side of the thorax allow separation from other Culex species with dark legs. The related Cx. molestus and Cx. globocoxitus do not have the constricted tergal bands and the former does not have the sternal dark scale patches. Cx. orbostiensis and Cx. cylindricus are superficially similar, but much smaller and do not have similar scale patches on the side of the thorax.
NSW (widespread), Vic (widespread), SA, Tas, (also Qld, NT and WA).
Adults are active from spring through autumn in many areas and throughout the year in some warmer zones; the species normally does not attack humans and appears to feed predominantly on rabbits and birds (interestingly this species is not as well sampled by dry-ice baited traps as by unbaited light traps).
Not expected to pose any pest concern because of non-human feeding habits, however the species is capable of carrying Murray Valley encephalitis (MVE) virus in the laboratory and MVE (and Kunjin virus has been isolated from Cx. australicus collected in the Murray valley so it may play a role in early seasonal virus activity initiation and amplification amongst other vertebrates; it may well also play an important role as a vector of myxomatosis.
modified from: Russell, R.C.
(1996). A colour photo atlas of mosquitoes of
Southeastern Australia. Medical Entomology, Westmead Hospital.