1891.] 



87 



Apical cross vein deficient .10. AcxiA, Dsv. 



Arista with the second joint short.* 



Facial edges (farialia) unarmed, or ciliated only along their lower part. 



External {discal) cross vein extremely oblique 11. Plagia, Mgn. 



External cross vein straight or only moderately oblique. 

 Eyes hairy. 



Third joint of the antennse not more than twice the length of the second, 

 and often less. 



Colour bright gold-green 12. Gtmnocheta, Dsv. 



Colour generally black or grey.f 

 Eyes of the male subcontiguous. 



Arista pubescent 13. Macquaetia, Dsv. 



Arista bare 14. Polidea, Mcq. 



Eyes of the male more or less widely separated. 

 Abdomen wide and oval. 



Eyes much shorter than the face 15. Nemor^a, Dsv. 



Eyes prolonged to near the bottom of the face. 



Cheeks hairy ; abdominal segments without discal setse . 



16. Chetoliga, End. 



Cheeks bare ; abdominal segments with setse on the disc... 



17. Nemoeilia, End. 

 Abdomen oblong. 



Colour grey and red 18. Olitieeia, Dsv. 



Colour shining black without red 19. Zophomyia, Mcq. 



Third joint of the antennse always twice (or more than twice) the length 



of the second. 

 Third joint of antennae very convex in front... 20. Epicampocera, Mcq. 



Third joint of antennse nearly straight in front 21. Exoeista, Mgn. 



Eyes bare. 



Third joint of the antennae not more (and often less) than twice the length 



of the second. 



Second joint of antennse somewhat prolonged 22. Tachina, F. 



Second joint of antennse not prolonged. 



Forehead prominent ; arista pubescent at the base, cheeks ciliated... 



23. Brachycoma, Dsv. 



52) Head wide and swollen, arista and cheeks bare... 



24. MiLTOGEAMMA, Mgn. 



Head neither wide nor swollen. 



Antennse with the third joint short and round 25. Trixa, Mgn. 



Antennse with the third joint oblong. 

 57) Abdomen subglobose 26. Clytia, Dsv. 



* In some species it is slightly prolonged, in others it can scarcely be distinguished from the 

 first joint. 



t In some species the colour may be metallic-blue or seneous, but never bright green 



