FAMDA' LAUXAXIID.E 



317 



KEY TO GENERA 



1. Antennae long and slender, the first segment two-thirds as long as the 



second and with apical hairs below 2 



Antennse not unusually elongate, the third segment usually more or 

 less oval, rarely twice as long as wide, the first short or without 

 bristles below 7 



2. Sternopleura with a single bristle 3 



Two sternopleural bristles (17, 18) Lauxania Latreille 



3. Propleural bristle present 4 



Propleural bristle absent (23, 26) Asilostoma Hendel 



4. Anterior pair of frontals decussate; face with transverse striae (9, 22). 



Steganolauxania Frey 

 Anterior pair of frontals reclinate , 5 



5. Submarginal cell but little wider than the marginal (8) 6 



Submarginal cell more than twice as wide as the marginal. 



Steganopsis de Meijere 



6. Face wdth a large, rounded convexity on either side. . . .Cephalella Malloch 

 Face without such swellings (8, 21) Lauxaniella Malloch 



7. Third vein setulose either above or below 8 



Third vein bare 10 



8. First vein setulose above Dryomyzothea Hendel 



First vein bare 



Lauxaniidas II. — 11, Xenopterella ; 12, Pachycerina ; 13, Griphoncura; 14, Minettia evit- 

 tata; 1,5, Sapromyza; 16, Physcgenua ; IT, Lauxania. 



