This species is black with a blue tint and lighter pruinescent covering. The legs are entirely black. The haltere knobs blackish and the wing crossveins are not clouded. The antennae black with the arista plumose. There are 4 pairs of postsutural dorsocentral bristles and well developed presutural acrostichal bristles are present. Bodylength around 7mm. Only the male is described and is notable for having eyes well separated. H. australasiae belongs to a complex of similar looking species, all others of which either not fully ascribe to the aforementioned characters or are poorly described.
Male
Mid Novemeber 2015
Knocklofty Reserve, Hobart
Male
Late December 2015
Sandfly
Female
Late November 2016
Sandfly
Male
Mid November 2014
Knocklofty Reserve, Hobart
Male
Early April 2019
Peter Murrell Reserve, Blackmans Bay
Male
Late December 2019
Mount Field National Park
Male
Late January 2020
Ridgeway
female
Early March 2021
Mount Wellington/kunanyi, near the pinnacle
Mid December 2021
Lewisham
