Admittedly, this is a group that I know little about. I have seen a lot of lacewings around, especially in Early Summer, but I haven't encountered too many antlions and only one owl fly, although they are considered fairly common.
Neuroptera have two pairs of heavily veined, membranous wings, a pair of compound eyes, mandibulate (chewing) mouthparts, and long, slender antennae, which can sometimes be club-like at the ends. Their bodies are elongated and soft.
They undergo complete metamorphism. The larvae are small, bizarre-looking creatures with large jaws that are used for seizing prey. They moult a few times before pupating and eventually emerging again as adults. Some species can take a couple of years to fully develop, but most take only a few months.
These are predatory insects. Some larvae live in small crater-like pits in sandy areas, waiting for another insect to stumble into the pit, where it is seized and dragged under the sand to be devoured. Ants are a common source of food, hence the name Antlion. Adults mostly prey on small insects such as aphids.
Neuropterans are found in many areas in Australia, green lacewings (Chrysopidae) being the most common.
Click on an image below to see the lacewings, antlions and owl flies of Australia.