Empididae. 



147 



15. 



16. 



— Thorax less shining, abdomen not quite diill; front 

 metatarsi in the male not quadratic 12. 



12. Dorsocentral bristles not long behind, those and the 

 acrostichal bristles on the whole very short 3. clypeata. 



— Dorsocentral bristles long behind, thoracic bristles longer. . . 13. 



13. Thorax and abdomen rather shining; wings strongly 



blackish brown; hind tibiæ in the female simple. . . 2. coracula. 



— Thorax and abdomen slightly shining; wings not 

 strongly tinged; hind tibiæ in the female more or 



less broad and curved 14. 



14. All legs somewhat short; exterior genitalia in the 

 male not large; front metatarsi only with a single 

 bristle; hind tibiæ in the female slightly broad and 



curved 9. hivittata. 



— All legs more slender; exterior genitalia in the male 

 large; front metatarsi with some bristles above; hind 

 tibiæ in the female distinctly broad and curved .... 7. pseiidochorica. 



Thorax light grey; wings milk-white 19. niveipennis. 



Thorax grey or brown with four distinct stripes, or 

 dark brown with indistinct stripes or with one broad 



stripe; wings not milk-white 16. 



Thorax dark brown with four indistinct stripes, or 



dark grey with one broad stripe; front tibiæ in the 

 male with more or less long bristles; hind tibiæ in 

 the female simple 17. 



— Thorax light grey or brown with four distinct stripes; 

 front tibiæ in the male not with long bristles; hind 

 tibiæ in the female more or less compressed and 

 curved 18. 



17. Thorax dark grey with one broad stripe; acrostichal 

 bristles quadriserial; front metatarsi in the male not 



much thickened, shorter than tibiæ 12. aeronetha. 



— Thorax dark brown with four indistinct stripes; acro- 

 stichal bristles biserial; front metatarsi very thick, as 



long as tibiæ 18. pilipes. 



18. Thorax grey; acrostichal bristles quadriserial or tri- 



to quadriserial 19. 



— Thorax brownish; acrostichal bristles biserial; occiput 



greyish brown 14. quadrivittata. 



19. Occiput quite grey; middle femora and tibiæ in the 



male with long hairs on the anterior side 13. puhipes. 



— Occiput more or less black, not quite grey ; middle 



legs in the male without long hairs 20. 



20. Occiput black above, grey below; the lateral stripes 



on thorax very near to the median pair 15. Beckeri. 



— Occiput black with a grey triangle above; the lateral 



stripes on thorax less near to the median pair .... 16. carinthiaca. 



21. Legs, except the tarsi, quite yellow 22. 



— Posterior legs more or less brownish or blackish; 

 balteres dark 25. 



10* 



