22 Orthonhapha brachycera. 



4. Colour not metallic, greyish or yellow; hypopygium 



roundlsh 19- Achalcus. 



— Colour brightly metallic; hypopygium elongated . . 20. Thrypticus. 



5. Posterior cross-vein as long as, or longer than the 



last part of the postical vein 6. 



— Posterior cross-vein shorter than the last part of 



the postical vein 8. 



6. Front femora and tibiæ with remarkably long spines 



below 22. Scellus. 



— Front femora and tibiæ without, or only with short 

 spines below 7. 



7. Front femora somewhat thickened at base, these and 

 the tibiæ with short spines below ; hind coxæ without 

 bristle; mesopleura not prolonged into a spine; 



scutellum with two or four bristles 23. Hydrophorns. 



— Front femora not thickened; these and the tibiæ 

 without spines; hind coxæ with a bristle on the 

 outside; mesopleura prolonged downwards into a 



spine; scutellum with six bristles 24. Liancalus. 



8. Abdomen depressed; epistoma narrow below the 

 antennæ, but widened downwards; legs of the male, 

 especially middle legs, generally more or less peculiar 



or armed with bristles 25. Campsicnemus. 



— Abdomen compressed; epistoma equally broad, or 

 narrowed downwards 9. 



9. Antennæ dark; abdomen dark metallic 10. 



— Antennæ and abdomen mainly orange 31. Bathycranium. 



10. Frons metallic; costa in the male with a long 



swelling ■ 27. Teucojyhorus. 



— Frons not metalhc; costa without swelling 28. Sympycnus. 



11. Wings somewhat dark variegated, in the male 



narrow towards the base without axillary lobe . . 26. Ectomus. 



— Wings not variegated, and not narrow towards the 



base in the male 12. 



12. Thoracic and scutellar bristles yellow 13. 



— Thoracic and scutellar bristles black 14. 



13. Arista nearly apical; hypopygium in the male small 29. Chrysotimus. 



— Arista distinctly dorsal; hypopygium in the male 



large and swoUen . . . . • 30. Xanthochlonis. 



14. Thorax strongly shining, almost black; third an- 

 tennal joint somewhat elongated, most in the 



male, pointed, arista near its base 32. Anepsiomyia. 



— Thorax dull; antennæ short; with the third joint 

 roundish, arista not near its base 15. 



15. Palpi large; hind metatarsus slightly shorter than 

 the second joint; posterior femora with preapical 

 bristles 16. 



— Palpi not large ; epistoma in the female with hairs 



