The abdomen of a Hatchet wasp, Evaniidae sp. (family), is quite flat on each side, being compressed laterally, and resembles a hatchet or flag. When moving around the wasp jerks the abdomen up and down constantly. It is a parasitic wasp and the female lays her eggs into the freshly laid egg cases of cockroaches. The egg cases are known as oothecae and one egg is laid for each ootheca. When the wasp egg hatches the larvae eats the cockroach eggs and then pupates, later emerging as an adult. The adults feed on flower nectar.
Evaniidae (family) is listed in the following regions:
Canberra & Southern Tablelands | Greater Sydney
Maps
Black Mountain Bruce Ridge Bruce Ridge to Gossan Hill Bullen Range Commonwealth & Kings Parks Dryandra St Woodland Gang Gang at Yass River Goulburn Mulwaree Council Holder Wetlands Lower Molonglo Molonglo River Reserve Mount Ainslie to Black Mountain Mount Painter Woodstock Nature ReservePlaces
Bruce, ACT Goulburn, NSW Holder, ACT Parkes, ACT