44 DIPTERA OF AUSTRALIA, 



DirMza, Loew. — Second longitudinal vein hardly undulating 

 before the cross-vein ; joints of the antennae sessile or almost 

 sessile in both sexes. 



Epidosis, Loew. — Second longitudinal vein sinuose before the 

 cross-vein ; joints of the antennae pedicelled in both .sexes ; their 

 number variable. 



II. Wings with four longitudinal veins. 



Asynapta, Loew. — The cross-vein is sometimes like that in 

 section A, and then the second longitudinal vein is not sinuated ; 

 sometimes as in section B, then the second longitudinal vein is 

 sinuated, like in Epidosis ; in this case also the collare is a little 

 prolonged. 



Spaniocera, Winnertz. 



Lasioptera, Meigen. 

 ClinorhyncJia, Loew. Mouth px'olonged in a rostrum. 



Section II. ANARETINA, Loew. 



I. Ocelli extant ; wings bare or almost bare ; third longitudinal 

 vein forked, the two folloAving veins simple. 



Zygoneura, Meig. — Antennae 16-jointed ; $ verticillate, joints 

 pedicelled ; 9 pubescent, joints .seissile ; branches of the fork of 

 the third longitudinal vein very arcuated at the base. 



Anarete, Hal. — Antennae 9-jointed, short, .slightly pubescent; • 

 joints subsessile, subglobose. 

 Wings pubescent. 

 Third longitudinal vein forked. 



Tritozyga, Loew. — The upper bi-anch of the fork forms a double 

 curve, almost in the shape of an S. 



