Polyzosteria mitchelli, also known as Mitchell's diurnal cockroach[2] or the Mardi Gras cockroach, is a species of bush cockroach found in Australia.

It is a diurnal species and its typical habitat is semi-arid regions of Australia's warm temperate zone.

Polyzosteria mitchelli is a wingless, dorsally-flattened insect.

It is primarily found in semi-arid areas of Western Australia, South Australia and New South Wales.

[3] P. mitchelli sprays a pungent defensive fluid from glands in its abdomen when disturbed.