Family 13. Xylophagidæ or Tree Flies.
Family 14. Cœnomyiidæ or Poplar Flies.
Family 15. Stratiomyiidæ or Manure Flies.
Family 16. Acanthomeridæ or Pomade Flies.
Family 17. Tabanidæ or Breeze Flies.
Family 18. Leptidæ or Fox Flies.
Family 19. Asilidæ or Hawk Flies.
Family 20. Midaidæ or Wolf Flies.
Family 21. Nemestrinidæ or Flower Flies.
Family 22. Bombyliidæ or Bee Flies.
Family 23. Therevidæ or Hairy Flies.
Family 24. Scenopinidæ or Window Flies.
Family 25. Acroceridæ or Sloth Flies.
Family 26. Empidæ or Little Hawk Flies.
Family 27. Dolichopodidæ or Fairy Flies.
Family 28. Lonchopteridæ or Water Flies.
Family 29. Syrphidæ or Dart Flies.
Family 30. Conopidæ or Wasp Flies.
Family 31. Pipunculidæ or Hedge Flies.
Family 32. Platypezidæ or Fungus Flies.
Family 33. Œstridæ or Bat Flies.
Family 34. Muscidæ or Meat Flies.
_Section 1.--Calypteræ._
Sub-family 1. Tachininæ or Parasitic Flies.
Sub-family 2. Descinæ or Rainbow Flies.
Sub-family 3. Sarcophaginæ or Screw Worms.
Sub-family 4. Muscinæ or Blow Flies.
Sub-family 5. Antromyiinæ or Summer Flies.
_Section 2.--Acalypteræ._
Sub-family 6. Scatophaginæ or Dung Flies.
Sub-family 7. Ortalinæ or Wood Flies.
Sub-family 8. Trypetinæ or Fruit Flies.
Sub-family 9. Piophilinæ or Cheese Flies.
Sub-family 10. Diopsinæ or Horn Flies.
Sub-family 11. Chloropinæ or Corn Flies.
Sub-family 12. Drosophilinæ or Mould Flies.
Sub-family 13. Agromyzinæ or Holly Flies.
Family 35. Phoridæ or Plant Flies.