If you've been surprised by the number of mozzies about as the weather cools, your home might be playing home to some London visitors.
Research out of the University of Sydney says the introduced Culex pipiens f molestus, also known as Culex molestus (or the London Underground mosquito, to its friends) remains active over the cooler months, unlike other species of mosquito, which hibernate.
They believe the species was introduced to Australia from Japan during World War II. It prefers to live underground, and is found in all states except Queensland and the Northern Territory.
London Underground mosquitoes are able to carry Ross River virus, and are best avoided or repelled.
There are about 300 species of mosquito in Australia, however, and it seems unfair to put all the blame for unseasonable buzzing and biting at the London Underground's door. Another reason for late-lingering mosquitoes may be a combination of one of the warmest autumns on record for NSW, and recent rains, providing an ideal breeding habitat.
Mozzies are a health hazard, and if you're serious about avoiding them, a multi-pronged approach is best.
First, make sure there is nowhere for still water to collect. Mosquitoes only need a tiny amount of stagnant water to breed in - thing the amount that could collect at the base of a pot-plant, or in an empty fizzy-drink can.
Then, make sure your fly-screens are up to scratch. Mozzies just need a tiny crack or tear to get in.
Long clothing can help protect the skin from any errant 'skeeters. Apply a good mozzie repellent to any exposed skin.
Finally, insecticides. They aren't always popular, but devices that zap bugs are often ineffective for mosquitoes. At the moment, chemical deterrence is the way to go, whether that be a spray, vaporiser, or mosquito coils.