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In part 1, keys to genera and species are provided for the 531 species of Agromyzidae, with a list of their host plants.In part 2, 85 new species are described, and 22 new synonymies and 16 new combinations are established.

The known Australian Agromyzidae have been revised, 24 new species are described and keys are given to genera and species in the 10 genera now known to be represented in Australia. The origin of the 57 species is discussed. No evidence is so far available of any close relationship with South American species and it is concluded that the Australian Agromyzidae have arrived from the north, in at least three distinct waves, the earliest possibly being in the Cretaceous. 5 5 306 My own observations made in January-February-admittedly not the best collecting season-suggest that the Agromyzidae are widespread in Australia but not abundant, as, for instance, in Western Europe or parts of South America. It is incorrect, as Paramonov (1959: 175) suggests, that many leaf-mining species of Agromyza and Phytomyza remain to be discovered. Certainly many new species do still await discovery, but there is no reason to believe they will not be found approximately in the proportions of the species now known, with a continuing dominance of Melanagromyza. In two days' collecting in Tasmania, on Mount Wellington and in the Mt. Field National Park, I was only able to discover two species. The main genera of the Agromyzidae have recently been characterized in detail by Frick (1952), and it is not proposed to recapitulate generic characters here, apart from those given in the key to genera. The scale line of the drawings represents 0•1 mm. for genitalia and pupal spiracles and 0•5 mm. in other cases, except where otherwise indicated. The following abbreviations have been used:ors-upper fronto-orbital bristle(s). ori-Iower fronto-orbital bristle(s). acr-acrostichals. dc-dorso central bristle(s). The dc are numbered forwards, the strongest being referred to as the first. The location of types of previously described species is indicated as follows:

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