18 THE DIPTERA-BRACHYCERA OF TASMANIA, 



3. Eyes bare. Corizoneura, Ricardo. 



Eyes hairy. Diatomineura, Rondani. 



Only the last two genera are known to occur in 

 Tasmania. 



18. Corizoneura, Ricardo. 



Wings with the first posterior cell open ; eyes bare. 



Two species are known to occur in Tasmania; a third 

 (C. dives, Macq.) has also been described, but I think 

 that this is probably only a denuded specimen of Diato- 

 mineura aurifiua, Donovan. 



Table of the Tasmanian Species of Corizoneura . 



1. Thorax and abdomen black. 2 



2. Legs black ; very small species. Anthracina, Macq. 

 Legs red ; large species. Rufovittata, Macq. 



Corizoneura anthracina, Macq. 



This species is described by Macquart as having the 

 thorax, abdomen, and legs black, and wings darkened. 

 Length, 7 mm. 



Corizoneura rufovittata, Macq. 



This species is described by Macquart as having the 

 antenna? red ; thorax black with red stripes ; abdomen 

 black with incisions red ; legs red ; wings yellow. 



Length, 16 mm. 



19. Diatomineura, Rondani. 

 Wings with the first posterior cell open ; eyes hairy. 



Table of the Tasmanian Species of Diatomineura. 



1. Antenna? black. 2 

 Antenna? red. 3 



2. Abdomen black, with yellow or golden centre- 



spots. Auriflua, Donovan. 



Abdomen violet-brown, with white centre-spots. 



Ianthina, Sp. nov. 



3. Abdomen brown or tawny ; femora yellow ; length 



of proboscis, 3 mm. Constans, Walk. 



Abdomen testaceous ; femora red ; length of pro- 

 boscis, 5 mm. Subappendiculata, Macq. 



Abdomen testaceous; femora black; length of pro- 

 boscis, 4 mm. Dorsomaculata, Macq. 



Abdomen bright violet. Violacea, Macq. 



