Orange Potter Wasp (lives near water, required for pot making). Seems to be distinguished from Delta latreillei latreillei by a three striped abdomen (orange-black-orange, only black-orange in latreillei) and different black & orange pattern on thorax.
Female is wingless. Adults feed on nectar. Female burrows into the ground, parasitising beetle larvae & mole crickets. They are important pollinators of native plants. Females sometimes mistaken for ants. (adapted from ABC website)