New Australian asilidae (diptera).

The present paper describes seventeen new species of Asilidae("Robber Flies"), eight of these being from Western Australia, and nine from Tasmania. The West Australian species were collected by Mr. G. H. Hardy, of the Tasmanian Museum, the Tasmanian species by myself. New genera are also proposed for two previously undescribed species. Leptogaster, Meig. Of this genus five Australian species have been previously described; four new species are now added, three of these being from Tasmania, and one from Western Australia. As the species belonging to this genus are somewhat difficult to determine, I am giving a table showing the distinguishing characters of all the Australian species