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A type of flower wasp, Blue "ants", aka Bluebottles, have a distinctive metallic blue-green body, with red legs. The female ranges up to 25 mm (1 inch) in length, is wingless and ground-dwelling, and exclusively hunts mole crickets, whereas all other species of tiphiids attack beetle larvae. The male is winged and about half her size.
It is a native of south and southeast Australia, including the Australian states of Tasmania, New South Wales, Victoria and South Australia. This one was in our garden.
It is the sole member of the subfamily Diamminae, and is both morphologically and behaviorally unusual among members of the family Tiphiidae. This female was very aggressive and kept raising her abdomen to mock a stinging attack.