Family Rhopalidae.
Similar in size to the Harlequin bug, but the body is a bit narrower. Overall reddish colour. In Canberra, large colonies can form under trees of the introduced Koelreuteria paniculata (Golden Rain Tree), where they appear to feed on the fallen seeds.
Leptocoris mitellatus is listed in the following regions:
Canberra & Southern Tablelands | Southern Highlands