BY ARTHUR WHITE. 25 



by species of Phycus and E ' ctinorrhynclius of waving their 

 front legs to and fro, giving them the appearance of 

 H ymenoytera with waving antennae. 



The Tasmanian species may all be referred to six genera, 

 five of which occur also on the mainland of Australia, 

 whilst the sixth, now described for the first time, appears 

 to be confined to Tasmania. 



Table of the Tasmanian Genera of Therevidce. 



1. Antennae very long, the first joint usually longer 

 than the head ; fourth posterior cell of wings 

 closed. Phycus, Walk. 



Antennae not very long, the first joint never longer 

 than the head, and usually much shorter. 2 



% Proboscis projecting prominently forwards. 3 



3. Wings; large and broad ; brightly coloured species ; 



fourth posterior cell open. 



Ectinorrhynchus, Macq. 

 Wings small and narrow; black species; fourth 

 posterior cell closed. 



Lonchorhynchus, Gen. nov. 

 Proboscis not projecting prominently forwards, and 

 frequently entirely concealed within the oral 

 aperture. 4 



4. Eyes widely separated in both sexes; front hairy; 



short robust species ; fourth posterior cell open. 



Anabarrhynchus, Macq. 

 Eyes joined or closely approximated in the male, 

 widely separated in the female ; front bare ; long 

 slender species. 5 



5. Fourth posterior cell open ; usually medium-sized 



species. Psilocephala, Zett. 



Fourth posterior cell closed ; very small species. 



Parapsilocephala, Krob. 



Alternative Table of the Tasmanian Genera of 

 Therevidce. 



1. Wings with the fourth posterior cell closed. 2 

 Wings with the fourth posterior cell open. 4 



2. Antennae very long, the first joint usually longer 



than the head. Phycus, Walk. 



Antennae short, the first joint much shorter than 

 the head. 3 



3. Proboscis projecting prominently forwards; me- 



dium-sized species. 



Lonchorhynchus, Gen. nov. 



