Until recently, the subfamilies here were placed in Empididae. The Tasmanian representatives are related to ancient Antarctic empidids.
Subfamily Ceratomerinae
Ceratomerinae adults are often found near running water, predating smaller insects.
Subfamily Trichopezinae
The flies we place here appear to belong in Trichopezinae having wing venation matching Heterophlebus and females with Trichopezinae characters – of note is the truncate abdomen, the 10th tergite with spines (in the flies below this is in the form of a single transverse row), and cercus strongly arched dorsally. They are not currently described and/or included in the Australian catalogue.
References
Australasian/Oceanian Diptera Catalog 2012. Family Brachystomatidae (treated in Empididae in 1989 catalog). In: Evenhuis, NL (ed.), Catalog of the Diptera of the Australasian and Oceanian Regions. (online version). Available at: http://hbs.bishopmuseum.org/aocat/brachystomatidae.html. Last accessed: 2 May 2012.
Sinclair, B. J. 2003. Taxonomy, phylogeny and zoogeography of the subfamily Ceratomerinae of Australia (Diptera: Empidoidea). Records of the Australian Museum 55: 1-44.
Sinclair, B. J. & Cumming, J. M. 2006. The morphology, higher level phylogeny and classification of the Empidoidea (Diptera). Zootaxa 1180: 1–172.