FAMILY EMPID.E THE DANCE FLIES 209 



14. Posterior legs simple (41) Bicellaria Macquart 



Posterior femora much enlarged and spinose Hoplocyrtoma Melander 



15. Discal cell emitting three veins apically or, if open, the fourth vein 



branched 1'7 



Discal cell emitting two veins apically IG 



16. Third antennal segment conical, the arista apical; middle tibiae with 



several sets of bristles Leptopeza Macquart 



Third antennal segment oval; the arista sub-dorsal; middle tibiae with 

 only apical bristles (7) Ocydromia Meigen 



17. Posterior femora enlarged and spinose beneath (53, 57)..CEdalia Meigen 

 Posterior femora not swollen 18 



18. Posthumeral bristles present; antennae apparently two segmented.... 19 

 Posthumeral bristles usually absent, the antennae with three segments. 



Euthyneura Macquart 



19. Antennae ending in a style 20 



Antennas without style or arista (51, 59) Allanthalia Melander 



20. Antennae situated near the middle of the head, the third segment 



elongate 21 



Antennee situated much below the middle of the head, the third seg- 

 ment broad (60, 63) Anthalia Zetterstedt 



21. Third antennal segment extremely long (45, 52) Axelempis Curran 



Third antennal segment normal Trichina Meigen 



22. Basal and anal cells very small; third vein never forked; abdomen 



shorter than the robust thorax 23 



Basal and anal cells not unusually short; third vein often furcate; 

 abdomen as long or longer than the thorax 25 



23. Eyes pubescent 24 



Eyes bare ( 37 ) Microphorus Macquart 



24. Face broadened below and more or less hairy; costa continuing around 



the wing (48, 55 ) Parathalassius Mik 



Face not broadened below and with only oral hairs. .Microphorella Becker 



25. Antenns with three segments 26 



Antennae apparently two-segmented Hormopeza Zetterstedt 



26. Proboscis directed obliquely forward or horizontal, the face broad, 



convex and short 27 



Proboscis normally vertical, if more or less oblique the face is long 

 and narrow 31 



27. Auxiliary vein entire, ending in the costa 28 



Auxiliary vein obsolete apically Brochella Melander 



28. Third vein furcate 29 



Third vein simple Anthepiscopus Becker 



29. Arista terminal, sometimes style-like 30 



Arista dorsal (34) Gloma Meigen 



30. Hypopleura bare (38) Iteaphila Macquart 



Hypopleura haired (4) .Oreogeton Schiner 



